CATALOG Hi-Tech® Fuse Products - library.e.abb.com · 030 –033 Hi-Tech® OS shorty back-up 034 Hi-Tech® FACT system 035 –043 Hi-Tech® EXT back-up 044 –052 Hi-Tech® FX full-range

—C ATALOG

Hi-Tech®Fuse Products

— Thomas & Betts is now ABBInstallation Products, but our longlegacy of quality products andinnovation remains the same. Fromconnectors that help wire buildingson Earth to cable ties that help putmachines in space, we continue towork every day to make, market,design and sell products thatprovide a smarter, safer and morereliable flow of electricity, fromsource to socket.

004 –005 Overview

006 –011 Elastimold® fused loadbreak elbows (EFX-E)

012 –018 Elastimold® molded current- limiting fuses (MCLF)

019 –029 Elastimold® molded canister fuses (MCAN)

030 –033 Hi-Tech® OS shorty back-up

034 Hi-Tech® FACT system

035 –043 Hi-Tech® EXT back-up

044 –052 Hi-Tech® FX full-range

053 –059 Hi-Tech® SX full-range

060 –063 Hi-Tech® EX full-range

— Table of contents

4 E L A S TI M O LD & H I -TECH FUSE PR O D U C TS

Elastimold fused products cover a wide range of applications and ratings. Fused elbows (FLR), molded current-limiting fuses (MCLF) and molded canister fuses (MCAN) provide full-range protection through 50 kA using Hi-Tech® full-range fuses. The fuses in these products can easily be replaced with minimal downtime. Fused load-break elbows provide low-cost, convenient protection for radial taps, junctions, transformers and other equipment. They combine the advantages of full-range current-limiting fusing with the convenience of 15/25 kV, 200 A hotstick-operable, loadbreak elbow switching. MCLF and MCAN are suitable for single-phase tap/load protection and can be used in vault, subsurface or padmount installations.

Elastimold fused products provide the benefits of current-limiting protection, with fault clearing occurring in less than one-half cycle, thereby limiting the let-through fault current and dramatically reducing stresses on equipment. They also provide both overload and fault current protection for distribution equipment in a single fuse body. As full-range fuses, they are capable of

interrupting any continuous current between the minimum current that can cause melting of the elements and its rated maximum interrupting current (50,000 A). All fuses are capable of interrupting in elevated ambient temperatures. Hi-Tech fuse design features include:

• A patented damage sensor that significantly reduces the risk of fuse failure should the fuse be subjected to an element-damaging current surge (e.g. lightning).

• Hermetically sealed construction ensures that no gases escape from the fuse during current interruption.

• All fuses are helium mass spectrometer leak tested to ensure sealing system integrity.

• Rugged machined-brass end caps used for greater ferrule strength, resulting in less distortion and a more secure fuse attachment.

Elastimold FLR, MCLF and MCAN fused products constitute some of the fastest and easiest ways to improve system reliability.

—Elastimold® fusesOverview

Capable of interrupting in elevated ambient temperature, Elastimold fuses are built tough to take the heat!

5EL A S TI M O L D FUSE S OV ER V I E W

Loop system without tap protection: A fault on the tap will lock out the substation breaker and create an outage for all customers to the open point.

Loop system with tap protection: A fault on the tap will be isolated by the fuses. This reduces the number of customers affected by the outage, thus improving the System Average Interruption Frequency Index (SAIFI).

—Full-range current-limiting fuse

Low-current interruption element (includes patented damage sensor)

Tin-plated brass cap

Compacted quartz sand

High-current interruption element

Epoxy joint

Soldered electrical connection and

sealing

Mica element support

Resin-rich filament wound glass/epoxy body

Welded element joints

—Improve loop system reliability by adding protection to a tap.

Note: NC = normally closed NO = normally open

Example: underground loop system

Breaker locks out Breaker closed

Fault Fuse isolates fault

NC NCNC NCB1 B1B2 B2

B2 B214 14S3 S3

Junction cabinet

Junction cabinetNC NC

NO NO

3-way unit 3-way unit


• Combined full-range current-limiting fusing 15/25 kV hotstick-operable, loadbreak elbow switching quickly improves the distribution system’s reliability without the expense of adding a separate piece of switchgear or replacing existing sectionalizing cabinets

• Current-limiting fuses improve the fault close rating of the elbow (10 kA) to that of the fuse, thereby reducing the risk of component damage or personnel injury

• Neon voltage indicators (V2) attached to elbow test points to provide quick and convenient blown-fuse indication

• EPDM molded rubber deadfront construction enables elbows to be fully sealed and submersible, and they insulate, shield and eliminate exposed live parts

• Two-piece housing enables easy fuse replacement

Replace existing 200 A tap elbows with Elastimold fused elbows to protect light-duty underground distribution systems, including sub-loops, radial taps, junctions, transformers and other equipment.

Elastimold fused elbows provide full-range current-limiting fusing with 50 kA interrupting capability. They are rated for 5 kV ungrounded to 28 kV grounded Wye. Plus they provide 15/25 kV hotstick-operable, loadbreak elbow switching.

—Elastimold®

Fused loadbreak elbows

The fastest, most cost-effective way to improve a distribution system’s reliability.

7EL A S TI M O L D FUSED LOA D B R E A K EL B OW S

—Ratings

System voltage class (kV) 15 25* 25/28*

Nominal fuse voltage (kV) 8.3 15.5 17.2

Rated maximum fuse voltage (kV) 8.8/10 15.5 17.2

Frequency (Hz) 50/60 50/60 50/60

BIL impulse withstand (kV) 95 125 140

One-minute AC withstand (kV) 34 40 45

Fifteen-minute DC withstand (kV) 53 78 78

Corona extinction (kV) 11 19 21.5

Symmetrical interrupting capability (A)

50,000 50,000 50,000

Current rating (A) 3–80 6–20 3–45

—Application information

Construction: Submersible, non-venting, deadfront, corrosion resistant

Ambient temperature range: -30 °C to 65 °C

* The 15.5 kV L-G rated fuse requires 75% grounded load to be applied on a 25 kV system. The 17.2 kV L-G rated fuse requires at least 75% grounded load to be applied on a 28 kV system.

Note: Fuses are only suitable for the system voltage class shown if the recovery voltage across the fuse will not exceed its rated maximum voltage. For three-phase applications, this generally requires that protected transformers be gndY–gndY and have at least 50% grounded load. Fuse replacement requires the elbow to be de-energized. For applications with Delta connections or less than 50% grounded load, the fuse maximum voltage must be greater than system line to line voltage, which may require using the next larger system class housing and fuse.

Lower elbow half

Hose clamp

Bi-metal crimp lug(08605xxx)

Fuse (EFX-E)

Probe lug(2000-103)

Upper elbow half

Probe (166 LRF or 274 LRF)

Certified tests Elastimold fused elbows have been designed and tested per applicable portions of IEEE, ANSI and other industry standards, including: ANSI C37.40 Standard for current-limiting fuse service conditionsANSI C37.41 Standard for current-limiting fuse design and testingANSI C37.47 Standard for current-limiting fuse ratings and specificationsIEEE 386 Standard for separable connectors


—Elastimold® Fused loadbreak elbows

—Electrical characteristics of Elastimold EFX-E elbow fuses

System voltage class (kV)

Nominal fuse voltage

rating (kV)

Current rating

(amps)

Fusecat. no.

(N1)

Ratedmaximum

voltage (kV)

Maximumcontinuous current (A)

(N2) (N6) (N7)

Peak arcvoltage

(kV)(N5)

Minimummelt I2t

(amp2-sec)

Maximumtotal I2t

(amp2-sec)(N3) (N4)

Fuse housing25 °C 40 °C 65 °C

15 8.3 3 EFX083003-E 10.0 4.3 4.2 3.9 30 100 350 168FLR1

6 EFX083006-E 9.5 9.0 8.5 32 620 2,700

8 EFX083008-E 11.5 11.0 10.5 28 800 4,000

10 EFX083010-E 14.0 13.5 13.0 28 800 4,000

12 EFX083012-E 19.0 18.5 17.5 26 920 8,000

18 EFX083018-E 21.0 20.0 19.0 26 1,310 9,500

20 EFX083020-E 26.0 25.0 24.0 26 1,620 11,000

25 EFX083025-E 34.0 33.0 31.0 26 3,660 22,000

30 EFX083030-E 37.5 36.5 34.5 26 5,250 30,000

40 EFX083040-E 43.0 42.0 40.0 26 8,700 50,000

45 EFX083045-E 49.0 47.0 45.0 26 12,800 70,000

65 EFX083065-E 8.8 70.0 68.0 64.5 23 34,000 200,000 168FLR3

80 EFX083080-E 80.0 77.5 73.5 22 51,200 280,000

25 15.5 6 EFX155006-E 15.5 8.5 8.0 7.7 52 620 3,000 274FLR1

8 EFX155008-E 10.5 10.0 9.5 40 800 4,300

10 EFX155010-E 13.0 12.5 12.0 40 800 4,300

12 EFX155012-E 16.0 15.5 15.0 38 920 8,000

18 EFX155018-E 20.0 19.5 18.5 38 1,620 13,000

20 EFX155020-E 23.5 22.5 21.5 38 2,200 16,500

25/28 17.2 3 EFX172003-E 17.2 4.3 4.2 3.9 51 100 510 274FLR3

6 EFX172006-E 9.5 9.0 8.5 54 620 3,250

8 EFX172008-E 11.5 11.0 10.5 46 800 4,600

10 EFX172010-E 14.0 13.5 13.0 46 800 4,600

12 EFX172012-E 18.0 17.5 16.5 43 920 8,500

18 EFX172018-E 20.0 19.5 18.5 45 1,310 10,000

20 EFX172020-E 24.0 23.0 22.0 45 1,620 12,500

25 EFX172025-E 31.5 30.5 29.0 45 3,660 27,500

30 EFX172030-E 35.5 34.5 32.5 45 5,250 37,500

40 EFX172040-E 41.0 40.0 38.0 45 8,700 62,500

45 EFX172045-E 46.0 45.0 42.5 45 12,800 87,500

Notes:N1. Ratings have maximum interrupting capability of 50 kA, except 17.2 kV 3 A (EFX172003-E) which tested at 44 kA.N2. Fuses have a rated maximum application temperature (RMAT) of 65 °C. RMAT is the maximum temperature of the air, in contact with the elbow housing, at which fuses have been shown to be suitable for use.N3. Tabulated maximum total I2t values are for currents of 50,000 A at the nominal voltage of the fuse. Values for 8.3 kV fuses at 10 kV are approximately 30% higher. Values for 17.2 kV fuses at 15.5 kV are approximately 20% lower. N4. Maximum total I2t values are reduced for currents below 50,000 A. For example, at 10,000 A, maximum total I2t values are approximately 15% less than the published values.N5. Peak arc voltages listed are for 50,000 A currents at the rated maximum voltage listed. Reduced currents and voltages will reduce the peak arc voltage. Consult the factory for further information.N6. Maximum continuous currents at ambient temperatures other than those listed may be determined by derating the fuses by .2% per degree C over 25 °C. For example: At 40 °C the derating would be 15 x .2 = 3%, making the maximum continuous current of a 17.2 kV, 25 A fuse 31.5 x .97 = 30.5 A.N7. Time-current characteristic curves are published at 25 °C. Reduction in the long time melting current of the fuses (approximately one hour and longer) due to higher ambient temperatures is the same as described above for “Maximum continuous currents.”


—Elastimold® Fused loadbreak elbows

—Recommended Elastimold EFX-E elbow fuse at 40 °C ambient temperature (3-phase GNDY-GNDY transformers)

Recommended fuse current ratings (amps)

Fuse voltage 8.3 kV 15.5 kV (17.2 kV)

3-phaseGNDY-GNDYtransformer kVA

Transformer 3-phase voltage rating (kV), phase to phase

2.4 4.16 4.8 7.2–7.96 8.32 12.47 13.2–14.4 20.8 22.9–24.9

A B A B A B A B A B A B A B A B A B

15 – 6 – 3 – 3 – 3a – 3a – 6a – 6a – 6a – (3a)

22.5 – 8 – 6a – 6a – 3 – 3 – 6a – 6a – 6a – (3a)

30 10 12 – 6 – 6 – 6a – 3 – 6a – 6a – 6a – (3a)

45 12 20 – 10 – 8 – 6 – 6a – 6a – 6a – 6a – (3a)

75 20 30 12 20 – 12 – 8 – 8 – 6 – 6 – 6a – (3)

100 30 45 18 25 18 20 – 12 – 10 – 8 – 8 – 6a – (6a)

112.5 40 65 20 25 18 25 – 12 – 12 – 8 – 8 – 6 – (6a)

150 45 80 25 40 20 30 18 20 12 20 10 12 10 12 – 6 – (6)

200 65 80 40 65 30 45 20 25 18 25 12 18 12 18 8 10 – (8)

225 80 – 45 65 40 65 20 30 20 25 12 20 12 18 8 10 – (10)

300 – – 65 80 45 80 30 45 25 40 18 25 18 25 12 18 – (12)

500 – – – – 80 – 65 80 45 80 30 45 30 45 18 (25) (18) (25)

750 – – – – – – 80 – 80 – 45 65 45 – (25) (45) (25) (40)

1,000 – – – – – – – – – – 80 – – – (40) – (40) –

Notes:1.Column A = 140–200% of transformer rating and Column B = 200–300% of transformer rating.2.Ratings in parentheses are 17.2 kV fuses.3. 8.3 kV, 3–45 A fuses and 15.5 kV, 6–20 A fuses are used in the small (size 1) elbow housing; 8.3 kV, 65–80 A fuses and 17.2 kV, 3–45 A fuses are used in the large (size 3) elbow fuse housing.4. Recommended fuses meet inrush criteria of 12 times transformer full-load current for .1 second and 25 times transformer full-load current for .01 second. Fuses also meet cold-load pickup criteria of 6 times transformer full-load current for 1 second and 3 times transformer full-load current for 10 seconds.a. Fuse allows greater than 300% of transformer rating.For applications with Delta connections or less than 50% grounded load, the fuse maximum voltage must be greater than system line to line voltage, which may require using the next larger system class housing and fuse.

—Recommended Elastimold EFX-E elbow fuse at 40 °C ambient temperature (single-phase transformer)


Fuse voltage 8.3 kV 15.5 kV (17.2 kV)

1-phase transformer kVA

Transformer 1-phase voltage rating (kV) phase-to-ground

2.4 4.16 4.8 7.2 7.62 12 14.4 16

A B A B A B A B A B A B A B A B

10 – 6 – 6a – 3 – 3 – 3 – 6a – 6a – (3a)

15 – 10 – 6 – 6a – 3 – 3 – 6a – 6a – (3a)

25 12 20 – 8 – 8 – 6 – 6 – 6a – 6a – (3)

37.5 20 25 – 12 – 12 – 8 – 6 – 6 – 6a – (6a)

50 25 40 18 20 12 20 10 12 – 10 – 6 – 6 – (6a)

75 45 65 20 30 20 25 12 20 12 18 – 10 – 8 – (8)

100 65 80 30 45 25 40 18 25 18 25 12 18 10 12 – (10)

167 – – 65 80 45 65 25 45 25 45 18 (25) 18 20 (12) (20)

250 – – 80 – 80 – 45 65 45 65 (25) (45) 20 (30) (20) (30)

333 – – – – – – 65 – 80 – (40) – (30) (45) (25) (45)

500 – – – – – – – – – – – – (45) – (45) –


Notes: 1. All dimensions rounded up to the nearest eighth inch.2. Also available with direct test port.3. Dimensions with direct test port units are 101⁄4" (260 mm) or 105⁄8" (270 mm).4. 168FLR3 uses a large housing with a 15 kV, 200 A elbow interface.

168FLR1 274FLR1 168FLR3 274FLR3

Cable insulation diameter Codein. mm0.575–0.740 15–19 A0.635–0.905 16–23 B.805–1.060 20–27 C.890–1.220 25–31 D

Conductor size(AWG)Stranded/compressed

Solid/compact

Connector code

6 – 180– 4 1904 – 200– 2 2102 1 2201 1/0 2301/0 2/0 2402/0 3/0 2503/0 4/0 2604/0 – 270

61⁄4"(159 mm)

105⁄8"(270 mm)

61⁄4"(159 mm)

105⁄8"(270 mm)

91⁄4"(235 mm) A

105⁄8"(270 mm)

101⁄2"(270 mm)

The following diagram shows how to construct a catalog number for fuse housings.

A = 87⁄8" (225 mm)A = 91⁄4" (235 mm)

87⁄8"(225 mm)

Indicates field that must be filled in to complete order.

FLR - 5

—Elastimold®

Fuse housings

Housing Ratings CodeSmall 8.3 kV 3–45 A 1 15.5 kV 6–20 ALarge 8.3 kV 65–80 A 17.2 kV 3–45 A 3

Fuse test port CodeTwo direct test ports ATwo capacitive test points Blank

Nominal fuse voltage rating (kV) Code8.3 16815.5 27417.2 274


8.3 kV (3–45 A)/15.5 kV (6–20 A) fuse

8.3 kV (65–80 A)/17.2 kV (3–45 A) fuse

Note: All dimensions rounded up to the nearest eighth inch.

131⁄2"(343 mm)

91⁄4"(235 mm)

21⁄4"(54 mm)

21⁄4"(54 mm)

The following diagram shows how to construct a catalog number for full-range current-limiting fuses.


EFX - E

Voltage rating (kV) Code8.3 08315.5 15517.2 172

Amp rating

Applicable housing

Code8.3 kV 15.5 kV 17.2 kV

3 16BFLR1 N/A 274FLR3 0036 16BFLR1 274FLR1 274FLR3 0068 16BFLR1 274FLR1 274FLR3 00810 16BFLR1 274FLR1 274FLR3 01012 16BFLR1 274FLR1 274FLR3 01218 16BFLR1 274FLR1 274FLR3 01820 16BFLR1 274FLR1 274FLR3 02025 16BFLR1 N/A 274FLR3 02530 16BFLR1 N/A 274FLR3 03040 16BFLR1 N/A 274FLR3 04045 16BFLR1 N/A 274FLR3 04565 16BFLR3 N/A NA 06580 16BFLR3 N/A NA 080

—Elastimold®

Full-range current-limiting fuses


Molded current-limiting fusesMolded current-limiting fuses feature modular construction with a center replaceable fuse section and interchangeable end fittings for elbow connection or direct attachment to equipment-mounted bushings. The various end fittings enable fuses to be applied throughout the system, including switchgear, junctions, transformers, cable runs and taps.

• EPDM molded rubber deadfront construction insulates, shields and eliminates exposed live parts

• Lightweight fuses are fully sealed and submersible

• Specially designed fuse elements with built-in low- and high-current interrupting capability provide full-range fault current protection through 50 kA

• Current-limiting protection limits the system available fault current and dramatically reduces stresses on equipment

• Internal fuse shield prevents corona and deterioration of the fuse element

• Modular construction with a center replaceable fuse section and interchangeable end fittings enables elbow connection or direct attachment to equipment-mounted bushings on junctions, transformers, cable runs and taps

• Compact – suitable for padmount, subsurface or vault installations

• 304 stainless steel brackets and hold-down straps available accommodate a wide variety of mounting arrangements

Elastimold® molded current-limiting fuses are available in:• 80 A through 180 A ratings for applications

on 5 kV systems• 6 A through 115 A ratings for applications

on 15 kVgrounded Wye systems• 6 A through 100 A ratings for applications

on 25 kV grounded Wye systems• 6 A through 50 A ratings for applications

on 35 kV grounded Wye systems

—Elastimold®

Molded current-limiting fuses (MCLF)

You’re covered. These fuses provide full-range protection through 50 kA interrupting current.

13EL A S TI M O L D M O L D ED C U R R ENT- L I M ITI N G FUSE S

Interchangeable molded rubber end fittings

Assembled fuse unit

Replaceable molded rubber current-limiting fuse

Assembled fuse unit with optional wall-mounting bracket


Construction: Submersible, non-venting,

deadfront, corrosion resistant

Ambient temperature range: -30 °C to 65 °C for 6–50 A fuses;

-30 °C to 40 °C for > 50 A fuses.

* 15.5 kV L-G rated fuses require 75% grounded load to be applied on a 25 kV system. ** 17.2 kV L-G rated fuses require at least 75% grounded load to be applied on a 28 kV system.Notes: Fuse replacement requires the MCLF to be de-energized. Fuses are only suitable for the system voltage class shown if the recovery voltage across the fuse will not exceed its rated maximum voltage. For three-phase applications, this generally requires that protected transformers be GNDY-GNDY and have at least 50% grounded load. For applications with Delta connections or less than 50% grounded load, the fuse maximum voltage must be greater than system line to line voltage, which may require using the next larger system class housing and fuse.

Certified tests Elastimold molded current-limiting fuses have been designed and tested per applicable portions of IEEE, ANSI, NEMA and other industry standards, including:ANSI C37.40 Standard for current-limiting fuse service conditionsANSI C37.41 Standard for current-limiting fuse design and testing

ANSI C37.47 Standard for current-limiting fuse ratings and specificationsANSI/IEEE 386 Standard for separable connectors and bushing interfaces

—Ratings

System voltage class (kV) 5 15 25/28* 35

Rated maximum fuse voltage (kV) 5.5 8.3/10** 15.5/17.2** 23

Frequency (Hz) 50/60 50/60 50/60 50/60

BIL impulse withstand (kV) 60 95 125/140 150

One-minute AC withstand (kV) 34 34 40–45 50

Fifteen-minute DC withstand (kV) 53 53 78 103

Corona extinction (kV) 11 11 19/21.5 26

Symmetrical interrupting capability (amp) 50,000 50,000 50,000 50,000

Current rating (amp) 80–180 10–115 10–100 10–50


—Electrical characteristics of encapsulated fuses used in MCLF

System voltage Class (kV)


rating (kV)

Currentrating

(amps)

Fusecat. no.

(N1)

Ratedmaximum

voltage(kV)

Maximum continuous current (A)

(N2) (N6)Peak arcvoltage

(kV) (N5)

Minimummelt I2t

(amp2-sec)

Maximumtotal I2t

(ampn-sec)(N3) (N4)25 °C 40 °C

5 5.5 80 M05CLF080 5.5 86 84 15 22,100 110,000

100 M05CLF100 108 105 15 56,700 280,000

125 M05CLF125 137 133 15 109,200 530,000

150 M05CLF150 159 154 15 176,000 860,000

180 M05CLF180 185 180 15 259,000 1,270,000

15 8.3 10 M15CLF010 10.0 14 13 28 800 4,000

20 M15CLF020 23 22 26 1,620 11,000

30 M15CLF030 35 33 26 5,250 30,000

40 M15CLF040 43 41 26 8,700 50,000

50 M15CLF050 51 47 26 12,800 70,000

65 M15CLF065 8.3 73 71 25 25,200 100,000

80 M15CLF080 87 84 25 47,000 185,000

100 M15CLF100 106 103 25 78,300 330,000

115 M15CLF115 120 116 25 115,150 480,000

25/28 15.5 10 M25CLF010 17.2 14 13 46 800 3,700

20 M25CLF020 23 22 45 1,620 10,000

30 M25CLF030 35 33 45 5,250 30,000

40 M25CLF040 43 41 45 8,700 50,000

50 M25CLF050 47 45 45 12,800 70,000

65 M25CLF065 15.5 68 66 40 25,200 110,000

80 M25CLF080 88 84 40 54,400 255,000

100 M25CLF100 100 97 40 80,000 380,000

35

23.0

10 M35CLF010

23.0

14 13 61 800 4,800

20 M35CLF020 23 22 60 1,620 13,000

30 M35CLF030 35 33 60 5,250 38,000

40 M35CLF040 41 40 60 8,700 61,000

50 M35CLF050 47 46 60 12,800 82,000

Notes: N1. Designs have a 50,000 A RMS symmetrical rating.N2. 10–50 A fuses have a rated maximum application temperature of 65 °C, and 65–180 A fuses have a rated maximum application temperature of 40 °C. (RMAT is the maximum temperature of the air in contact with the MCLF housing at which the fuses have been shown suitable for use.)N3. Tabulated maximum total I2t values are for currents of 50,000 A at the nominal voltage of the fuse. Fuses that have a rated maximum voltage higher than their nominal voltage rating will have a higher I²T let-through when applied at voltages up to these higher values. For example, maximum total I2t values are increased by approximately 30% when 8.3 kV fuses are applied at 10 kV and approximately 25% when 15.5 kV fuses are used at 17.2 kV.N4. Maximum total l²T values are reduced for currents below 50,000 A. For example, at 10,000 A, I2t values are approximately 15% less than the published values.N5. Peak arc voltages quoted are for 50,000 A currents at the rated maximum voltage listed. Reduced currents and voltages will reduce the peak arc voltage. Consult the factory for further information.N6. Maximum continuous currents at higher ambient temperatures may be determined by derating the fuses by .2% per degree C over 25 °C. For example: At 40 °C, the derating would be 15 x .2 = 3%, making the maximum continuous current of a 20 A fuse 23.0 x .97 = 22 A.

—Elastimold® Molded current-limiting fuses (MCLF)


—Recommended MCLF at 40 °C ambient temperature (3-phase transformer GNDY-GNDY)


Fuse voltage (5.5 kV) 8.3 kV 15.5 kV 23 kV

3-phaseGNDY-GNDYtransformer kVA


2.4 4.16 4.8 7.2–7.96 8.32 12.47 13.2–14.4 20.8 22.9–24.9 34.5

A B A B A B A B A B A B A B A B A B A B

15 – 10a – 10a – 10a – 10a – 10a – 10a – 10a – 10a – 10a – 10a

22.5 – 10 – 10a – 10a – 10a – 10a – 10a – 10a – 10a – 10a – 10a

30 – 10 – 10a – 10a – 10a – 10a – 10a – 10a – 10a – 10a – 10a

45 – 20 – 10 – 10 – 10a – 10a – 10a – 10a – 10a – 10a – 10a

75 30 40 – 20 – 20 – 10 – 10 – 10a – 10a – 10a – 10a – 10a

100 40 50 20 30 20 30 – 20 – 10 – 10 – 10 – 10a – 10a – 10a

112.5 40 65 20 30 20 30 – 20 – 20 – 10 – 10 – 10a – 10a – 10a

150 50 (80) 30 50 30 40 20 30 – 20 – 10 – 10 – 10a – 10a – 10a

200 65 (100) 40 65 40 50 20 30 20 30 – 20 – 20 – 10 – 10 – 10a

225 (80) (125) 50 65 40 65 30 40 30 50 – 20 – 20 – 10 – 10 – 10a

300 (100) (150) 65 (100) 65 (80) 40 50 30 50 20 30 20 30 – 20 10 20 – 10

500 (180) – (100) (150) (100) (125) 65 (80) 50 80 30 50 30 50 20 30 20 30 – 20

750 – – (180) – (125) (180) (80) (125) 80 115 50 80 50 65 30 50 30 40 20 30

1,000 – – – – (180) – (125) (180) 115 – 65 100 65 100 50 65 40 65 30 40

1,500 – – – – – – (180) – – – 100 – 100 – 65 100 65 80 40 –

2,000 – – – – – – – – – – – – – – 100 – 80 – 50 –

Notes:1.Column A = 140–200% of transformer rating and Column B = 200–300% of transformer rating.2.Ratings in parentheses are 5.5 kV fuses.3. Recommended fuses meet inrush criteria of 12 times transformer full-load current for .1 second and 25 times transformer full-load current for .01 second. Fuses also meet cold-load pickup criteria of 6 times transformer full-load current for 1 second and 3 times transformer full-load current for 10 seconds. a. Fuse allows greater than 300% of transformer rating.For applications with Delta connections or less than 50% grounded load, the fuse maximum voltage must be greater than system line to line voltage, which may require using the next larger system class housing and fuse.

—Recommended MCLF at 40 °C ambient temperature (single-phase transformer)





2.4 4.16 4.8 7.2 7.62 12 14.4 16 19.9


10 – 10a – 10a – 10a – 10a – 10a – 10a – 10a – 10a – 10a

15 – 10 – 10a – 10a – 10a – 10a – 10a – 10a – 10a – 10a

25 – 20 – 10 – 10 – 10a – 10a – 10a – 10a – 10a – 10a

37.5 20 30 – 20 – 20 – 10 – 10 – 10a – 10a – 10a – 10a

50 30 40 20 30 – 20 – 10 – 10 – 10a – 10a – 10a – 10a

75 50 65 30 40 20 30 – 20 – 20 – 10 – 10 – 10 – 10a

100 65 (80) 40 50 30 50 20 30 20 30 – 20 – 10 – 10 – 10

167 (100) (150) 65 (80) 50 65 30 50 30 50 20 30 20 30 – 20 – 20

250 (150) – (100) (125) (80) (100) 50 65 50 65 30 50 30 40 20 30 20 30

333 (180) – (125) (180) (100) (150) 65 100 65 100 50 65 30 50 30 50 20 40

500 – – (180) – (150) – 115 – 115 – 65 100 65 80 50 – 40 –

750 – – – – – – – – – – 100 – 80 100 – – – –

1,000 – – – – – – – – – – – – 100 – – – – –

—Elastimold®



165⁄8" (422 mm)

191⁄2" (343 mm)

51⁄8"(130 mm)

Approx. weight 30 lb. (13.6 kg)

83⁄16"(208 mm)

4"(102 mm)

165⁄8" (422 mm)

235⁄8" (343 mm)

51⁄8" (130 mm)

83⁄16"(208 mm)


165⁄8" (422 mm)

275⁄8" (702 mm)

51⁄8"(130 mm)

4"(102 mm)

4"(102 mm)

83⁄16"(208 mm)


165⁄8" (422 mm)

195⁄8" (498 mm)

51⁄8"(130 mm)

93⁄16"(233 mm)


Lifting eye

111⁄8"(283 mm)

9⁄16" (14 mm) x 1" (25 mm) mounting slots on

51⁄2" (140 mm) centers

23⁄4"(70 mm)

3⁄4"(19 mm)

63⁄8"(162 mm)

221⁄2"(572 mm)

185⁄8"(473 mm)

51⁄8"(130 mm)



Model 22

Model 222

Model 2222

Model 66

Model 6E2


The following diagram shows how to construct a catalog number for a molded current-limiting fuse:

Note: Other models are available such as 26.

111⁄8"(283 mm)

Lifting eye

Voltage class (kV) Code5.0 0515.0 1525.0 2535.0 35 See page 14 for additional information.

Amps

Voltage class Amp code5 kV 15 kV 25 kV 35 kV

– 10 10 10 010– 20 20 20 020– 30 30 30 030– 40 40 40 040– 50 50 50 050– 65 65 – 06580 80 80 – 080100 100 100 – 100– 115 – – 115125 – – – 125150 – – – 150185 – – – 185

See page 14 for additional information.

Optional mounting brackets/accessories

Bracket code

Wall mounting bracket with parking stands and bolted style hold down straps (HDS)

WMB

Wall mounting bracket with parking stands and quick release style hold down straps (QRS)

WMBQ

Tilt mounting adapter; requires either WMB or WMBQ to enable up to 60° angle

TMA

Support mounting bracket for use with models 6E2 or 6E6 end-fitting arrangements; includes bolted-style hold-down strap

SMB

Bolted-style hold-down strap (qty: 1 required per end fitting)

HDS

Quick-release style hold-down strap (qty: 1 required per end fitting)

QRS

*Options maybe purchased separately


M CLF -

BushingsBushing

code

200 A bushing wells both ends 22

200 A bushing well on one end and two 200 A bushing wells on the other end

222

Two 200 A bushing wells on both ends

2222

600 A bushings on both ends 66

600 A elbow connector on one end and 200 A bushing well on the other end (not available for 35 kV)

6E2

600 A elbow connector on one end and 600 A bushing on the other end (not available for 35 kV)

6E6

See outline drawings preceding this chart for additional details.

—Elastimold®


Model 6E6

9⁄16" (14 mm) x 1" (25 mm) mounting slots on

51⁄2" (140 mm) centers

51⁄8"(130 mm)

23⁄4"(70 mm)

63⁄8"(162 mm)

221⁄2"(572 mm)

185⁄8"(473 mm)

1⁄2"(13 mm)



15 to 60°

Approx. Weight 8 lb. (3.6 kg) 9⁄16" (14 mm) x 1" (25 mm) Mounting slots

63⁄4"(171 mm)

Optional WMB mounting bracket with adjustable parking stands for vertical mounting and fuse hold-down strips

Optional – TMA universal tilt mounting

51⁄2"(140 mm)

—Mounting options

293⁄4" (756 mm)

323⁄4" (832 mm)

—Optimal end fittings

Cat. no. Description System voltage class (kV)IEEE 386-1995

interface reference

EF2 200 A bushing well end fitting 5, 15, 25 Figure 3

EF22 Double 200 A bushing well end fitting 5, 15, 25 Figure 3

EF6 600 A bushing end fitting 5, 15, 25 Figures 11 and 13

EF6E 600 A elbow connector end fitting 5, 15, 25 Figure 11

Note: EF6E is equipped with a standard through-hole spade lug (Type 03700). Use this table only if end fittings are to be ordered and shipped separately from the fuse. See pages 16-17 for assembled units.

3⁄8" (10 mm)Sq. drive

3⁄16" (5 mm) Hex

—Other options

Cat. no. Description

MCLF-ADT Hex wrench for set screw removal and replacement when disassemblingend fittings. Supplied as standard with replacement fuses.


19EL A S TI M O L D M O L D ED C A N IS TER FUSE S

MCAN molded canister fuse• EPDM molded rubber deadfront construction

insulates, shields and eliminates live parts• Fuses are fully sealed and submersible • Modular construction enables elbow connection

or direct attachment to equipment-mounted bushings

• Neon voltage indicators (V2) attached to elbow test points to provide quick and convenient blown-fuse indication

• Various end fittings and bushings make for flexible installation on switchgear, junctions, transformers, cable runs and taps

• Replaceable fuse enables easy fuse replacement without full removal from installation

• Current-limiting protection limits the system available fault current and dramatically reduces stresses on equipment

• 304 stainless steel mounting brackets and wall-mounted parking stands available to accommodate a wide variety of mounting arrangements

—Elastimold®

Molded canister fuses (MCAN)

Completely sealed and insulated for padmount, subsurface or vault applications through 28 kV GNDY–GNDY.


—Fuse ratings

Nominal voltage rating (kV) 8.3 15.5

Rated maximum voltage (kV) 8.8/10.0 15.5/17.2**

Frequency (Hz) 50–60 50–60

Current rating (amps) 3–80 3–65

Rated maximum interrupting current (sym. amps)

50,000 50,000

—Fuse canister ratings

System voltage class (kV) 15 25/28

Maximum line-to-ground voltage (kV) 8.8/10.0 15.5/17.2

BIL impulse withstand (kV) 95 125/140

One-minute ac withstand (kV) 34 40–45

Fifteen-minute dc withstand (kV) 53 78

Corona extinction (kV) 11 19–21.5

Maximum continuous current (amps) 200* 200*

Momentary current (kA) 10* 10*

The MCAN molded canister fuse is a compact, lightweight EPDM molded rubber fuse enclosure package. MCAN fuse canisters are maintenance-free, completely sealed and submersible. Designs are deadfront, using molded rubber to insulate, shield and eliminate exposed live parts. Units are

ideally suited for padmount, subsurface or vault applications, for systems through 28 kV GNDY–GNDY. The MCAN molded canister fuse will accommodate and has been thoroughly tested with Hi-Tech® Trans-Guard® FX fuses. Contact ABB before using fuses from other manufacturers.

Certified testsElastimold molded canister fuses have been designed and tested per applicable portions of IEEE, ANSI, NEMA and other industry standards, including:

ANSI C37.40 Standard for current-limiting fuse service conditionsANSI C37.41 Standard for current-limiting fuse design and testingANSI C37.47 Standard for current-limiting fuse ratings and specifications ANSI/IEEE 386 Standard for separable connectors and bushing interfaces


Construction: Submersible, corrosion resistant, fully shielded

Ambient temperature range: -30 °C to 65 °C

* Without fuse.** The 15.5 kV L-G rated fuses require at least 75% grounded load to be applied on a 25 kV system.Note: Fuse replacement requires the MCAN to be de-energized. For applications with Delta connections or less than 50% grounded load, the fuse maximum voltage must be greater than system line to line voltage, which may require using the next larger system class housing and fuse.

—Elastimold® Molded canister fuses (MCAN)



200 A bushing wells

600 A bushing

600 A elbow

200 A bushing well

200 A bushing well

FX full-range current-limiting fuse

Latching lever

End plug with eye

Mounting feet

Molded EPDM rubber insulation and shielding

Cable connection bushings or wells

Cable connection bushings or wells


Low-current interruption element (includes patented damage sensor)

Tin-plated brass cap

Filled with compacted quartz sand

High-current interruption element

Epoxy jointSoldered electrical connection and sealing


Resin-rich filament wound glass/epoxy body

Welded element joints

0.625" (15.9 mm)

—Elastimold® FX current-limiting fuse for MCAN


Notes: N1. Ratings have maximum interrupting capability of 50 kA, except 17.2 kV 3 A (HTFX240003) which tested at 44 kA.N2. Fuses have a rated maximum application temperature of 65 °C. (RMAT is the maximum temperature of the air in contact with the MCAN housing, at which fuses have been shown to be suitable for use.)N3. Tabulated maximum total I2t values are for currents of 50,000 A at the nominal voltage of the fuse. Fuses that have a Rated Maximum Voltage higher than their Nominal Voltage Rating will have a higher I2t let-through when applied at voltages up to these higher values. For example, maximum total I2t values are increased by approximately 30% when 8.3 kV fuses are applied at 10 kV and approximately 25% when 15.5 kV fuses are used at 17.2 kV.N4. Maximum total I2t values are reduced for currents below 50,000 A. For example, at 10,000 A, maximum total I2t values are approximately 15% less than the published values.N5. Peak arc voltages quoted are for 50,000 A currents at the rated maximum voltage listed. Reduced currents and voltages will reduce the peak arc voltage. Consult the factory for further information.N6. Maximum continuous currents at higher ambient temperatures may be determined by de-rating the fuses by .2% per degree C over 25 °C. For example: At 65 °C, the de-rating would be 40 x .2 = 8%, making the maximum continuous current of a 30 A fuse 34 x .92 = 31 A.N7. Reduction in the long time melting current of the fuses (approximately one hour and longer) due to higher ambient temperatures is the same as described above in Note #6. See time-current characteristics for melting characteristics in this time region.

—Electrical characteristics of Hi-Tech® FX fuses inside MCAN canisters



rating (kV)

Current rating

(amps)

Fusecat. no.

(N1)

Rated maximum

voltage (kV)

Maximum continuous current (A)(N2) (N6) Peak arc

voltage (kV)(N5)

Minimum melt I2t

(amp2-sec)

Maximum total I2t

(amp2-sec) (N3) (N4)25 °C 40 °C 65 °C

15 8.3 3 HTFX230003 10 4.3 4.2 3.9 30 100 350

6 HTFX230006 9.5 9 8.5 32 620 2,700

8 HTFX230008 11.5 11 10.5 28 800 4,000

10 HTFX230010 13.5 13 12.5 28 800 4,000

12 HTFX230012 17.5 17 16 26 920 8,000

18 HTFX230018 19.5 19 18 26 1,310 9,500

20 HTFX230020 24 23 21.5 26 1,620 11,000

25 HTFX230025 29.5 28.5 27 26 3,660 22,000

30 HTFX230030 34 33 31 26 5,250 30,000

40 HTFX230040 40 39 36.5 26 8,700 50,000

50 HTFX230050 45.5 44 42 26 12,800 70,000

65 HTFX230065 8.8 70 68 64.5 23 34,000 200,000

80 HTFX230080 80 77.5 73.5 22 51,200 280,000

25/28 15.5 3 HTFX240003 17.2 4.3 4.2 3.9 51 100 510

6 HTFX240006 9.5 9 8.5 54 620 2,600

8 HTFX240008 11.5 11 10.5 46 800 3,700

10 HTFX240010 13.5 13 12.5 46 800 3,700

12 HTFX240012 17.5 17 16 43 920 6,500

18 HTFX240018 19.5 19 18 45 1,310 8,000

20 HTFX240020 24 23 21.5 45 1,620 10,000

25 HTFX240025 29.5 28.5 27 45 3,660 22,000

30 HTFX240030 34 33 31 45 5,250 30,000

40 HTFX240040 40 39 36.5 45 8,700 50,000

50 HTFX240050 44.5 43 40 45 12,800 70,000

65 HTFX240065 15.5 57.6 56 54.5 39 28,300 164,000



Notes: 1. Column A = 140–200% of transformer rating and Column B = 200–300% of transformer rating.2. 8.3 kV, 3–50 A fuses are used in mounting code 4 canisters; 8.3 kV 65–80 A fuses and 15.5 kV 3–50 A fuses are used in mounting code 5 canisters; 15.5 kV 65 A fuse is used in mounting code 6 canisters.3. Recommended fuses meet inrush criteria of 12 times transformer full-load current for .1 second and 25 times transformer full-load current for .01 second. Fuses also meet cold-load pickup criteria of 6 times transformer full-load current for 1 second and 3 times transformer full-load current for 10 seconds.a. Fuse allows greater than 300% of transformer rating.For applications with Delta connections or less than 50% grounded load, the fuse maximum voltage must be greater than system line to line voltage, which may require using the next larger system class housing and fuse.

—Recommended FX: in MCAN at 40 °C ambient temperature


Fuse voltage 8.3 kV 15.5 kV

1-phasetransformer kVA

Transformer 1-phase voltage rating (kV), phase to ground

2.4 4.16 4.8 7.2 7.62 12 14.4 16


10 – 6 – 6a – 3 – 3a – 3a – 3a – 3a – 3a

15 – 10 – 6 – 6a – 3 – 3 – 3a – 3a – 3a

25 12 20 8 10 – 8 – 6 – 6 – 3 – 3 – 3

37.5 20 30 12 18 – 12 – 8 – 8 – 6a – 6a – 6a

50 25 50 18 25 12 20 10 12 – 10 – 6 – 6 – 6a

75 50 65 25 40 20 30 12 20 12 20 – 10 – 8 – 8

100 65 80 30 50 25 50 18 25 18 25 – 12 10 12 – 10

167 – – 65 80 65 80 30 50 30 50 18 25 18 25 12 20

250 – – – – 80 – 65 80 50 65 25 50 25 40 20 30

333 – – – – – – 80 – 65 – 50 65 30 65 25 50

500 – – – – – – – – – – 65 – 65 – 50 –

—Recommended FX: in MCAN at 40 °C ambient temperature (3 phase transformer GNDY-GNDY)


Fuse voltage 8.3 kV 15.5 kV

3-phaseGNDY-GNDYTransformer kVA


2.4 4.16 4.8 7.2–7.96 8.32 12.47 13.2–14.4 20.8 22.9–24.9


15 – 6 – 3 – 3 – 3a – 3a – 3a – 3a – 6a – 3a

22.5 – 8 – 6a – 6a – 3 – 3 – 3a – 3a – 6a – 3a

30 10 12 – 6 – 6 – 6a – 3 – 3a – 3 – 6a – 3a

45 12 20 – 10 – 8 – 6 – 6a – 3 – 3 – 6a – 3a

75 25 40 12 20 12 18 – 8 – 8 – 6 – 6 – 6a – 3

100 30 50 18 25 18 25 – 12 – 10 – 8 – 8 – 6a – 6a

112.5 40 65 20 30 18 25 – 18 – 12 – 8 – 8 – 6a – 6a

150 65 80 25 50 25 40 12 25 12 18 – 10 – 10 – 6 – 6

200 80 – 40 65 30 50 18 30 18 25 12 18 – 12 – 8 – 8

225 – – 50 65 40 65 20 40 20 30 12 20 12 20 – 10 – 8

300 – – 65 80 65 80 25 50 25 50 18 25 18 25 – 12 – 12

500 – – – – – – 30 80 65 80 30 50 30 50 18 25 18 25

750 – – – – – – 65 – 80 – 65 80 50 – 25 50 25 50

1,000 – – – – – – – – – – 80 – – – 40 65 40 –

1,500 – – – – – – – – – – – – – – 65 – – –




Nominal fuse

voltage rating (kV)

Current rating

(amps)Fuse

cat. no.

Rated maximum

voltage (kV)

Mounting code

Diameter code

(A) Overall

diameter in. (mm)

(B) Pverall length

in. (mm)

(C) Contact

length in. (mm)

(D) Body

length in. (mm)

Canister cat. no.

Fuse weight lb. (kg)

15 8.3 3 HTFX230003 10.0 4 B 2.25(57)

10.0(254)

1.02(26)

7.96(202)

MCAN-4B15-22MCAN-4B15-66

MCAN-4B15-6E2MCAN-4B15-6E6

3.00(1.3)6 HTFX230006

8 HTFX230008

10 HTFX230010

12 HTFX230012

18 HTFX230018

20 HTFX230020

25 HTFX230025

30 HTFX230030

40 HTFX230040

50 HTFX230050

65 HTFX230065 8.8 5 B 2.25(57)

14.31(363)

1.02(26)

12.27(312)



4.25(1.9)80 HTFX230080

25/28 15.5 3 HTFX240003 17.2 5 B 2.25(57)

14.31(363)

1.02(26)

12.27(312)



4.25(1.9)6 HTFX240006

8 HTFX240008

10 HTFX240010

12 HTFX240012

18 HTFX240018

20 HTFX240020

25 HTFX240025

30 HTFX240030

40 HTFX240040

50 HTFX240050

65 HTFX240065 15.5 6 B 2.25 (57)

17.12 (435)

1.02 (26)

15.09 (383)

MCAN-6B25-22 4.75 (2.2)

Note: For 5 kV systems, use the 8.3 kV rated fuses.

C

B

D

A

—Hi-Tech® FX fuses with MCAN



The following diagram shows how to construct an MCAN housing order:

—Ordering MCAN housing

Voltage (kV) Current (A) Code

8.3 3–50 4B

8.3 65–80 5B

15.5 3–50 5B

15.5 65 6B

Nominal fuse voltage (kV)

System class code

8.3 1515.5 25Note: See page 25 for compatible fuse ordering information.


MCAN - -

Bushings Code200 A bushing wells both ends 22600 A bushings on both ends 66600 A elbow connector on one end and 200 A bushing well on the other end

6E2

600 A elbow connector on one end and 600 A bushing on the other end

6E6

—FX current-limiting fuse for MCAN



553⁄64"(152 mm)

A

B

51⁄2"(140 mm)

23⁄4"(70 mm)

67⁄16"(164 mm)

15⁄32"(12 mm)

37⁄32"(82 mm)

C

81⁄32" (204 mm)

553⁄64"(152 mm)

AB

51⁄2"(140 mm)

23⁄4"(70 mm)

6 7⁄16"(164 mm)

15⁄32"(12 mm)

37⁄32"(82 mm)

C

815⁄16" (227 mm)

553⁄64"(152 mm)

A

B

51⁄2"(140 mm)

23⁄4"(70 mm)

67⁄16"(164 mm)

15⁄32"(12 mm)

37⁄32"(82 mm)

C

815⁄16" (227 mm)


527⁄32"(148 mm)

AB

51⁄2"(140 mm)

23⁄4"(70 mm)

67⁄16"(164 mm)

15⁄32"(12 mm)

37⁄32"(82 mm)

C

8 1⁄32"(204 mm)

Model 22

Model 66 Model 6E6

Model 6E2


—Weights and dimensions

Cat. no.

Dimensions Approx. weight Bushings

A in. (mm) B in. (mm) C in. (mm) lb. (kg) End bushing Main bushing

MCAN-4B15-22 21.49 (546) 10.06 (256) 10.91 (277) 19 (8.6) 200 A bushing well 200 A bushing well



MCAN-4B15-66 21.49 (546) 10.06 (256) 10.91 (277) 21 (9.5) 600 A bushing 600 A bushing



MCAN-4B15-6E2 23.90 (607) 10.06 (256) 12.91 (328) 20 (9) 600 A elbow connector 200 A bushing well



MCAN-4B15-6E6 23.90 (607) 10.06 (256) 12.91 (328) 20 (9) 600 A elbow connector 600 A bushing






—MCAN molded canister fuse options and accessories

Neon voltage indicators provide quick and convenient indication of an energized circuit when they are mounted to the test-point provision on MCAN elbow connectors. The voltage indicator illuminates with a flashing neon light when the elbow connector is energized. If the fuse blows, the neon lights on the load-side elbows stop flashing.

A mounting code adapter is used to extend the fuse end cap ferrule so that a shorter fuse may be installed in a higher-number coded canister. For example, a 4B size fuse can be used in a 5B canister when an MCAN 4-5 adapter is used.

Parking stands can be mounted adjacent to an MCAN fuse canister, enabling attachment of additional accessories to ground, isolate and test the elbow cable connectors.

Elastimold multi-point junctions can be utilized to create custom switchgear lineups consisting of MVS switches, MVI fault interrupters, MCLF current-limiting fuses, MCAN fuse canisters, fused elbows, elbow arresters and other molded products. The junction enables easy assembly and interconnection of components into fully shielded, submersible, compact arrangements.


V2 Capacitive test point, voltage indicator

Voltage indicators

Mounting code adapters


MCAN 4-5 Code 4B size fuse to a Code 5B canister



Parking stands


160WMPS Wall-mount parking stand

Suffix no. Description

-PS Parking stand between bushings

Switchgear assemblies


Trans-Guard OS Shorty fuse ABB Hi-Tech OS Shorty is a back-up type current-limiting fuse designed for application within distribution transformers. Its ability to significantly reduce fault energy and its very high interrupting capabilities provide state-of-the-art protection against rising available fault currents.

As a back-up current-limiting fuse (refer to IEEE C37.40 for fuse definitions), the Trans-Guard OS Shorty must always be applied in series with a properly sized low-current protective device. This device is typically an under-oil expulsion fuse (i.e., bay-o-net or load sensing link, terminal board weak link, etc.). The expulsion and current-limiting fuse are each selected to provide fault protection over a certain range of currents. The expulsion fuse is chosen to clear the low-magnitude currents such as those caused by faults that occur external to the transformer, high-impedance faults within the transformer, and in the case of load sensing links, transformer overloads. Such currents are generally below the minimum interrupting current of the current-limiting fuse. The back-up current-limiting fuse is selected as to clear all other faults up to maximum interrupting capability.

In addition to interrupting the fault currents resulting from low-impedance faults within the transformer, the back-up current-limiting fuse serves the very important function of limiting the amount of energy that is let through to the source of the fault to a value below the withstand capability of the transformer tank. By doing this the current-limiting fuse minimizes the likelihood of disruptive equipment failures (i.e. transformer tank ruptures, accessories being damaged or broken loose from their mountings, etc.). No other protective device is available to similarly reduce the risk of disruptive transformer failures.

OS Shorty fuses are manufactured in the United States and compact in size, which is especially critical in small single phase distribution transformers. Distribution transformers protected solely by an expulsion fuse have very low interrupting capacity, ranging between 600 and 3,500 A, and are subjected to higher risk of tank damage during an internal fault condition. These units also are subjected to large amounts of additional arcing and energy during an internal fault that may affect additional equipment on the distribution system. If a fault occurs that exceeds the expulsion fuse interrupting capability, the fault will continue to arc within the transformer until another protective device has time to react. This situation can increase the number of affected customers while extending the time required to restore service. The OS Shorty’s high interrupting capabilities not only reduce the duration of arcing inside the transformer, but also isolate the fault to the transformer which minimizes the effects of the event.

—Hi-Tech®

Trans-Guard® OS Shorty backup CLF

31H I -TECH TR A NS - G UA R D OS SH O RT Y B ACKU P CL F

—Dimensional information

Nominal fuse voltage rating(kV)

Current rating

(amps)

Fuse cat. no.

(N1)

Overalldiameter A

in. (mm)

Overalllength Bin. (mm)

Bodylength Cin. (mm)

Fuse weight lb. (kg)

8.3 30 HTSS132030 1.5(38.1)

6.24 (162.6)

5.2 (132.1)

0.900.1440 HTSS132040

50 HTSS132050

65 HTSS232065 2.2 (55.9)

7.5 (190.5)

6.3 (160.0)

2.00.9180 HTSS232080

100 HTSS232100

125 HTSS232125 11.0 (279.4)

9.9 (251.5)

3.251.45150 HTSS232150

165 HTSS232165

200 HTSS232200

17.2 30 HTSS142030 1.5(38.1)

9.8 (248.9)

8.6 (218.4)

1.3 0.5440 HTSS142040

50 HTSS242050 2.2"(55.9)

9.0 (228.6)

7.8 (198.12)

2.5 1.1

65 HTSS242065 11.8 (299.7)

10.6 (269.2)

3.25 1.4880 HTSS242080

100 HTSS242100

125 HTSS242125 16.6 (421.6)

15.5 (393.7)

4.75 2.15150 HTSS242150

15.5 165 HTSS242165

23.0 30 HTSS152030 1.5(38.1)

11.7 (297.2)

10.5 (266.7)

1.5 0.6840 HTSS152040

50 HTSS252050 2.2(55.9)

12.5 (317.5)

11.3 (287.0)

3.25 1.48

65 HTSS252065 16.1 (408.9)

15.25–15.33 (378.5)

4.75 2.1580 HTSS252080

100 HTSS252100

38.0 65 HTSS372065 3.3(83.8)

19.4(492.8)

18.3(464.8)

12.05.480 HTSS372080

100 HTSS372100

125 HTSS372125

140 HTSS372140 22.1(561.3)

21.0(533.4)

13.56.1165 HTSS372165

200 HTSS372200

A

B

C

1⁄4-20 threaded hole1⁄2" deep (both ends)

Note: N1. HTSS372200 is a parallel fuse application only and requires 2 HTSS372200 fuses connected in parallel per phase.

—Hi-Tech®



—Electrical characteristics (single fuses)

Nominalfuse voltagerating(kV)

Currentrating

(amps)

Fusecat. no.

(N1)

Ratedmaximum

voltage(kV)

Rated maximum

interrupting current (kA)

Peak arcvoltage

(kV)(N3)

MinimumI/C

(amps)

Minimummelt I2t

(amp2-sec)

Maximumtotal I2t

(amp2-sec)(N1) (N2)

8.3 30 HTSS132030 8.3 50.0 25 250 1,300 7,100

40 HTSS132040 340 2,550 8,000

50 HTSS132050 400 3,500 13,200

65 HTSS232065 10.0 350 3,700 18,000

80 HTSS232080 430 6,300 31,000

100 HTSS232100 570 12,800 66,000

125 HTSS232125 8.3 26 850 39,000 120,000

150 HTSS232150 24.5 900 23,000 110,000

165 HTSS232165 24 1,020 39,500 175,000

200 HTSS232200 1,120 54,500 225,000

17.2 30 HTSS142030 17.2 44.0 49 250 1,300 7,800

40 HTSS142040 340 2,550 9,000

50 HTSS242050 50.0 440 4,440 17,000

65 HTSS242065 360 3,700 22,000

80 HTSS242080 440 6,300 36,000

100 HTSS242100 580 12,800 76,000

125 HTSS242125 44.0 540 14,800 66,000

150 HTSS242150 700 34,800 137,000

15.5 165 HTSS242165 15.5 48 780 51,200 195,000

23.0 30 HTSS152030 23.0 31.0 63 270 1,300 8,800

40 HTSS152040 63 360 2,550 10,000

50 HTSS252050 25.5 50.0 71 570 3,200 20,000

65 HTSS252065 70 360 3,700 17,000

80 HTSS252080 440 6,300 28,000

100 HTSS252100 575 12,800 70,000

38.0 65 HTSS372065 38.0 50.0 110 390 2,600 12,100

80 HTSS372080 490 5,600 23,500

100 HTSS372100 675 13,900 55,000

125 HTSS372125 785 19,300 70,000

140 HTSS372140 26.0 105 715 25,000 99,000

165 HTSS372165 50.0 1,200 43,500 155,000

200 HTSS372200 1,180 51,000 180,000

Notes:N1. HTSS372200 is a parallel fuse application only and requires 2 HTSS372200 fuses connected in parallel per phase.N2. Tabulate maximum total I2t values are at the nominal voltage of the fuse. Values for 17.2 kV fuses at 15.5 kV are reduced by approximately 12%, while values for 8.3 kV and 23 kV fuses at 10 kV and 25.5 kV are increased by approximately 30% and 13% respectively.N3. Maximum total I2t values are reduced for currents below bellow Max IC. For example, at 10,000 A, max I2t values are approximately 15% less than published values.N4. Peak arc voltages quoted are for Max IC at the rated maximum voltage listed. Reduced voltage and currents will reduce the peak arc voltage. Consult the factory for information.

—Hi-Tech®


33H I -TECH TR A NS - G UA R D OS SH O RT Y B ACKU P CL F

—Hi-Tech®


—Electrical characteristics (fuses tested for use in parallel)

Nominalfuse voltagerating(kV)

Currentrating

(amps) (N1)

Fusecat. no.

(Order two fuses)

Ratedmaximum

voltage(kV)

Rated maximum

interrupting current (kA)

Peak arcvoltage

(kV)(N4)

Minimuml/C

(amps)

Minimummelt I2t

(amp2-sec)

Maximumtotal I2t

(amp2-sec)(N2) (N3)

8.3 130 HTSS232065 8.3 – 25 420 14,800 65,000

160 HTSS232080 500 25,200 114,000

200 HTSS232100 630 51,200 240,000

300 HTSS232150 1,900 92,000 425,000

330 HTSS232165 2,150 158,000 675,000

400 HTSS232200 2,380 218,000 850,000

17.2 130 HTSS242065 17.2 50.0 49 420 14,800 92,000

160 HTSS242080 500 25,200 162,000

200 HTSS242100 630 51,200 310,000

250 HTSS242125 44.0 1,130 59,200 265,000

15.5 300 HTSS242150 15.5 44.0 1,500 139,200 515,000

330 HTSS242165 50.0 1,670 204,800 733,000

23.0 130 HTSS252065 25.5 50.0 69 360 14,800 68,000

160 HTSS252080 450 25,200 115,000

200 HTSS252100 560 51,200 280,000

Notes:N1. Current ratings shown are achieved by using a parallel combination of two fuses (order two fuses). To facilitate equal sharing of the interrupting duty, the two fuses should be resistance matches (+/- 2%) and be mounted such that current paths to and from each fuse are symmetrical.N2. Tabulate maximum total I2t values are at the nominal voltage of the fuse. Values for 17.2 kV fuses at 15.5 kV are reduced by approximately 12%, while values for 23 kV fuses at 25.5 kV are increased by approximately 13% respectively.N3. Maximum total I2t values are reduced for currents below bellow Max IC. For example, at 10,000 A, max I2t values are approximately 15%less than published values.N4. Peak arc voltages quoted are for Max IC at the rated maximum voltage listed. Reduced voltage and currents will reduce the peak arc voltage. Consult the factory for information.

Fuse Selection: For a detailed explanation on selecting the appropriate backup current-limiting fuse for a given application, please refer to Hi-Tech Fuses Application Bulletin FS-10.

For a quick and convenient method of selecting the proper Trans-Guard OS Shorty fuse for coordination with under oil expulsion fuses, please visit Hi-Tech’s fuse application coordination tool located at http://www.tnb.com/Hi-TechFACT.


The new Hi-Tech fuse application coordination tool, also known as Hi-Tech FACT, offers a simple, real-time solution to optimize backup current-limiting fuse selection based on the provided transformer configuration. FACT provides multiple types of expulsion fuses common in the industry allowing users to select a specific rating as needed when defined by industry or utility specifications. Whether it’s a standard or custom application, FACT offers quick and easy generation of time current curves (TCC) and effortless sharing of the ideal fuse solution.

—Service

• Real-time turnkey data • Easy-to-use drop-down menus• Dedicated support email and documents readily

available

—Flexibility

• Non-standard unit configuration options available

• Highest rated capability• Quickly create multiple protection options with

various expulsion fuses

—Safety

• Fuse selection optimization minimizes catastrophic equipment failure

• Protective margins between fuses ensure proper coordination

• Backup CLF protection increases interrupting capability and improves fault isolation

To get started, visit www.tnb.com/Hi-TechFACT.

—Hi-Tech® FACT systemHi-Tech fuse application coordination tool

Fuse selection made easier

Tim

e (s

eco

nd

s)

0.010.01 10 100 1000 10000

0.1

1

10

100

1000

Current (amperes)

Transformer Characteristics

Inrush & cold-load Bolted secondary fault Exp total clearing Exp min melt OS shorty min melt

Transformer rated current: 15.6 A Bolted secondary fault current: 781.2 A

35H I -TECH TR A NS - G UA R D E X T B ACKU P C U R R ENT- L I M ITI N G FUSE S

—Hi-Tech® EXT backup current-limiting fusesTrans-Guard® EXT current-limiting backup fuse

Minimize energy let-through – maximize equipment protection.

—01 The Trans-Guard EXT current-limiting backup fuse interrupts high-level currents and must be applied in series with another device capable of interrupting low- to mid-level currents. This is most commonly a cutout expulsion fuse. When properly coordinated, the Trans-Guard EXT current-limiting backup fuse always allows sufficient let-through current to cause the cutout fuse to melt and drop open, making it easy to visually pinpoint where the fault occurred.

In addition to interrupting higher fault currents, the Trans-Guard EXT current-limiting backup fuse serves the very important function of limiting the amount of energy let-through to the source of the fault to a value below the withstand capability of the equipment being protected.

New and improved design offers you:• Smaller size and lighter weight for easier handling• Lowest energy let-through in the industry• The most complete range of ratings available• Lowest total I2t let-throughs in the industry

provide maximum protection for equipment by minimizing energy let-through during a fault

• Higher melt I2t’s on smaller fuse ratings make fuses less susceptible to damage from current surges

• High fault interrupting capability – as high as 50 kA symmetrical

• Shorter, lighter weight design makes fuses easy to handle and install

• Integral pre-assembled hardware reduces installation time and likelihood of joint deterioration

ApplicationDesigned to enhance protection on overhead distribution systems, the Trans-Guard EXT current-limiting backup fuse both significantly reduces energy let-through during a fault and offers very high interrupting capability to provide state-of-the-art protection against today’s ever-increasing available fault currents.

—01


Expulsion fuse operation Current-limiting fuse operation

Current peak

Current interruption

Current peak


Fuse current Fault current Energy let-through

• Durable design features machined brass endcaps and filament-wound epoxy, centerless ground tubular bodies coated with oven-baked acrylic paint

• Broadest range of ratings available – up to 100 kA at 8.3 kV and 15.5 kV; up to 80 kA at 23 kV

• Current-limiting action improves power quality by reducing voltage dip time during a fault and reduces flame discharge and noise associated with the operation of the series-connected cutout fuse

• Wide variety of mounting and connection options for greater flexibility in installation

• 100% leak tested to ensure hermetic sealing• Reduced energy let-through provides arc

flash reduction

—Type of Installations

Arrester

Transformerprimary bushing

EXTbackup

fuse

Cutoutfuse

link infuseholder

Arrester


EXTbackup

fuse

Cutoutfuse

link infuseholder

Arrester


EXTbackup

fuse

Cutoutfuse

link infuseholder

Arrester


EXTbackupfuse

Cutoutfuse

link infuseholder

Source side cutoutinstallation

Load side cutoutinstallation

Bushing mount installation

Hot-line/bail installation

Arrester


EXTbackup

fuse

Cutoutfuse

link infuseholder

Arrester


EXTbackup

fuse

Cutoutfuse

link infuseholder

Arrester


EXTbackup

fuse

Cutoutfuse

link infuseholder

Arrester


EXTbackupfuse

Cutoutfuse

link infuseholder






Arrester


EXTbackup

fuse

Cutoutfuse

link infuseholder

Arrester


EXTbackup

fuse

Cutoutfuse

link infuseholder

Arrester


EXTbackup

fuse

Cutoutfuse

link infuseholder

Arrester


EXTbackupfuse

Cutoutfuse

link infuseholder





Arrester


EXTbackup

fuse

Cutoutfuse

link infuseholder

Arrester


EXTbackup

fuse

Cutoutfuse

link infuseholder

Arrester


EXTbackup

fuse

Cutoutfuse

link infuseholder

Arrester


EXTbackupfuse

Cutoutfuse

link infuseholder






—Hardware code

Hardware code(X) 1st end hardware 2nd end hardware

1 Spade Knurled stud

5 Parallel-groove Knurled stud

6 Parallel-groove Spade

8 Eyebolt Knurled stud

9 Universal adapter Spade

C Universal adapter Knurled stud

F Eyebolt Eyebolt

G Parallel-groove Eyebolt

H Eyebolt Spade

J Eyebolt Universal adapter

W Parallel-groove Parallel-groove

Z Parallel-groove Universal adapter

—Hardware for 12 kA to 40 kA ratings

Universal adapterrotatable through 180°

SpadeEyebolt(accepts #8 – 2/0)

1.3"

0.42"

1.1"or

1.5"

1.1" for 1.5" dia. fuses1.5" for 2.2" dia. fuses

Parallel-groove(accepts #6 – 2/0)

1.3"

B

3.3"

Knurled stud

2.7"

0.29"

0.29"

A

—Ordering information

Base cat. no.*

Nominal voltage rating (kV) Current rating (kA)

Dimension “A” (in.)

Dimension “B” (in.)

Weight(lbs.)

HTDE23 (X) 012 8.3 12 1.5 5.2 1.0

HTDE23 (X) 025 25 1.5 7.1 1.1

HTDE23 (X) 040 40 2.2 6.3 2.2

HTDE24 (X) 012 15.5 12 1.5 8.6 1.3

HTDE24 (X) 025 25 1.5 11.9 1.8

HTDE24 (X) 040 40 2.2 10.4 3.3

HTDE25 (X) 012 23.0 12 1.5 10.5 1.6

HTDE25 (X) 025 25 2.2 13.4 4.0

HTDE25 (X) 040 40 2.2 13.4 4.0

* When ordering, replace the (X) in the base catalog number with the appropriate hardware code from the chart below.

—Hi-Tech® EXT backup current-limiting fusesTrans-Guard® EXT current-limiting backup fuse for 12 kA to 40 kA ratings


—Trans-Guard® EXT current-limiting backup fuse for 100 kA ratings

—Ordering information

Base cat. no.*

Nominal voltage

rating (kV)

Current rating

(kA)

Dimensions (in.)Weight

(lbs.)“A” “B”

HTDE33 (X) 065 8.3 65 3.3 9.9 7.5

HTDE33 (X) 080 80

HTDE34 (X) 065 15.5 65 3.3 15.5 10.5

HTDE34 (X) 080 80

HTDE35 (X) 065 23.0 65 3.3 18.3 12.5

HTDE35 (X) 080 80

* When ordering, replace the (X) in the base catalog number with the appropriate hardware code from the chart below.

—Hardware code

Hardware code (X) 1st end hardware 2nd end hardware

A Threaded stud Threaded stud

E Eyebolt Knurled stud

F Eyebolt Eyebolt

U Eyebolt Universal adapter

Eyebolt(accepts #8 – 2/0)

Threaded stud(1⁄2"–13 threads)

Knurled stud

Universal adapterrotatable through 180°

2.2"

3.3"

1.8"

2.4"

0.46"

0.29"

A

B

Base cat. no.

Nominal voltage

rating (kV)

Current rating

(kA)

Dimensions (in.)Weight

(lbs)“A” “B” “C”

HTDE23E100 8.3 100 4.9 14.0 11.9 7.5

HTDE24E100 15.5 100 4.9 19.4 17.5 10.5


1.8"0.46"

C

B

A

—Hi-Tech® EXT backup current-limiting fusesTrans-Guard® EXT current-limiting backup fuse for 65 kA to 80 kA ratings

39H I -TECH TR A NS - G UA R D E X T B ACKU P C U R R ENT- L I M ITIN G FUSE S

—Electrical characteristics of Trans-Guard EXT current-limiting backup fuse

Nominal voltage rating (kV)

Current rating

(kA)

Rated maximum interrupting current (kA)

Rated maximum

voltage (kV)

Maximum system

voltage (kV)

Peak arc voltage

(kV)

Minimum melt I2t

(amp2-sec)

Maximum total I2t

(amp2-sec)

8.3 12 50 8.3 14.4 26 2,700 8,000

25 26 11,000 29,000

40 25 26,000 72,000

65 22 67,000 230,000

80 22 156,000 580,000

100 24 218,000 850,000

15.5 12 44 17.2 27.6 47 2,700 9,000

25 49 11,000 34,000

40 47 26,000 85,000

65 50 15.5 24.9 44 67,000 230,000

80 44 156,000 580,000

100 46 204,000 730,000

23.0 12 31 23.0 34.5 62 2,700 10,000

25 60 11,000 37,000

40 62 26,000 88,000

65 50 65 67,000 220,000

80 63 123,000 360,000

—Trans-Guard EXT current-limiting backup fuse/expulsion fuse link coordination

Trans-Guard EXT fuse rating (kA)

Coordinates with links up through

Type K Type T Type N Type S Type H Type D Type X Type QA Type KS

12 12 8 20 5 8 3 2.5 15 3

25 25 15 30 7 8 20 10 30 7

40 40 20 50 15 8 20 15 50 15

65 65 30 60 25 8 20 15 75 15

80 80 50 85 40 8 20 15 100 15

100 100 65 85 50 8 20 15 125 15

Voltage Selection – Refer to first table below. Each Trans-Guard® EXT current-limiting backup fuse is suitable for use in both single-phase and three-phase applications where the system voltage does not exceed the Maximum System Voltage listed. For single-phase applications on delta systems, one fuse is needed in each line.

Current-Rating Selection – Refer to second table below. Each Trans-Guard EXT current-limiting backup fuse will coordinate with any link having a rating no greater than that listed. For types of links not listed in this table, please contact ABB for assistance.

Hardware Selection – Many different hardware options are available. Some options vary depending on the size of the Trans-Guard EXT current-limiting backup fuse required.

—Hi-Tech® EXT backup current-limiting fuses


Minimize energy let-through. Maximize equipment protection.Commonly used on 34.5 kV and lower systems to enhance protection, external current-limiting backup fuses coordinate with series expulsion fuse to offer very high interrupting capability and reduce energy let-through during a fault. The proven benefits of the two fuse approach widely used on distribution systems is now available for application up to 138 kV that traditionally only protected by a standard expulsion fuse.

—Safety

• Offers a higher interrupting capability than a stand-alone expulsion fuse

• Significant reduction in energy let-through

—Environmentally friendly

• Lessens the chance of an oil leakage by reducing the energy let-through during a short circuit fault condition

• Fully sealed design ensures that no contaminates are released into the environment during operation

—Life cycle cost reduction

• Minimizes transformer damage during an internal fault condition, thus making repairs less costly

• Minimizes effects to transformer and surrounding infrastructure

—01

—02


Current peak


Current peak




Current peak


Current peak




Current peak


Current peak




Current peak


Current peak




Current peak


Current peak



—Hi-Tech® EXT backup current-limiting fusesTrans-Guard® EXT current-limiting backup fuse for 46–138 kV systems

—01 Expulsion fuse operation—02 Current-limiting fuse operation


—Trans-Guard EXT current-limiting backup fuse for 69–138 kV systems

—Hardware for 10 kA to 50 kA ratings

A

B—Ordering 46 kV

46 kV catalog numbers

Base cat. no.*


Current rating (kA)

Dimension 'A' (inches)

Dimension 'B' (inches)

Weight (lbs)

HTDE37 (X) 010 38.0 10 3.3 18.3 12.5

HTDE37 (X) 015 38.0 15 3.3 18.3 12.5

HTDE37 (X) 025 38.0 25 3.3 18.3 12.5

HTDE37 (X) 030 38.0 30 3.3 18.3 12.5

HTDE37 (X) 050 38.0 50 3.3 21.0 13.5

*When ordering, replace (X) in the base catalog number with the appropriate hardware code from the chart below.

Hardware code (*) 1st end hardware 2nd end hardware

A Threaded stud Threaded stud

E Eyebolt Knurled stud

F Eyebolt Eyebolt

U Eyebolt Universal adapter

—Hardware code: 10 kA to 50 kA

For 69 kV application: 1x HTDE37X100 module

Base cat. no.


Current rating (kA)

Dimension ‘A’ (inches)

Dimension ‘B’ (inches)

Dimension ‘C’ (inches)

Dimension ‘D’ (inches)

Weight (lbs)

HTDE37X100 38.0 100 7.9 25.1 28.6 29.6 32

—Ordering 69 kV

Knurled stud

2.2"

0.46"

Threaded stud(1⁄2" – 13 threads)

1.9"

Universal adapterrotatable through 180˚

3.3"

.29"


2.0"

—Ordering 115–138 kV

For 115 / 138 kV application: 2x HTDE37X100 modules in series required

For 115 / 138 kV applications, two (2) HTDE37X100 are required and ordered individually. The modules should be assembled in series during field installation. Reference the 69kV table above for individual dimensions of each module. The overall length will depend on installation.

D

B

A

C

—Hi-Tech® EXT backup current-limiting fusesTrans-Guard® EXT current-limiting backup fuse for 46 kV systems


—EXT selection


Current rating (kA)

Rated max interrupting current (kA)

Rated max voltage (kV)

Max system voltage (kV)

Peak arc voltage (kV)

Min. melt I2t (amp2-sec)

Max total I2t (amp2-sec)

38.0 10 50 38.0 48.3 110 2,600 12,100

38.0 15 50 38.0 48.3 110 5,600 23,500

38.0 25 50 38.0 48.3 110 13,900 55,000

38.0 30 50 38.0 48.3 110 19,300 70,000

38.0 50 50 38.0 48.3 110 43,500 155,000

38.0 100 20 42.5 69.0* 106 172,000 830,000

—Table 1: Electrical characteristics

Trans-Guard EXT fuse rating (kA) S&C SMD standard speed (TCC 153-1) S&C SMD slow speed (TCC 119-1)

10 10E –

15 15E 15E

25 25E 25E

30 30E 30E

50 50E 40E

100 100E 80E

—Table 2: Expulsion fuse link coordination

Voltage selectionEach EXT current-limiting backup fuse is suitable for use in both single-phase and three-phase applications where the system voltage does not exceed the maximum system voltage listed. For single-phase applications on delta systems, one fuse is needed in each line.

Current-rating selection Each EXT current-limiting backup fuse will coordinate with any link having a rating no greater

than that listed. For link types not listed in Table 2, please contact ABB for assistance. For additional coordination information, please consult application guide FS-10.

Hardware selection Many different hardware options are available. Some options vary depending on the size of the current-limiting backup fuse required. Please refer to ordering information for available options.

*Maximum system voltage increased to 138 kV when two (2) 100 K modules are used in series.

—Hi-Tech® EXT backup current-limiting fusesTrans-Guard® EXT current-limiting backup fuse for 46–138 kV systems

43H I -TECH TR A NS - G UA R D E X T B ACKU P C U R R ENT- L I M ITIN G FUSE S

Features Benefits/Descriptions

Superior performance Clears high current faults by modifying the circuit conditions, resulting in clearing faults before the nature occurring zero crossing, results in tremendous reduction is I2t let-through the system would have been

subjected to otherwise.

High fault interrupting capability As high as 50 kA symmetrical. (see Table 1)

Durable, robust design Extends outdoor life and includes machined brass endcaps and filament-wound epoxy, centerless ground tubular bodies, ground and coated with oven-baked acrylic paint.

Current-limiting action Improves power quality by reducing voltage dip time during a fault and reduces flame discharge and noise associated with the operation of the series-connected cutout fuse.

Hermetically sealed 100% leak tested to ensure hermetic sealing.

Minimal equipment damage Current-limiting action minimizes the internal damage to the transformer during a primary fault condition; therefore, making equipment repair less expensive.

Matched-melt coordination Ensures sufficient energy let-through to melt open series-connected expulsion fuse, providing visual indication of the fault.

—01 138 kV EXT current-limiting backup fuse in series with power expulsion fuse offers state of the art protection. When properly coordinated, the Trans-Guard® EXT current-limiting backup fuse always allows sufficient let-through current to cause the power expulsion fuse to melt and drop open, making it easy to visually pinpoint where the fault occurred.

Application for 46–138 kV systems Field tested and proven to reduce the energy let through during a fault, the Trans-Guard EXT current-limiting backup fuse family now includes options at 46 kV, 69 kV and 138 kV. All coordinate with existing power explusion fuses to create an ideal two-fuse protection scheme.

In addition to increasing the interrupting capabilities of the standalone expulsion fuse, the Trans-Guard EXT drastically decreases the amount of energy let-through and peak currents during a high current fault condition. The two-fuse combination provides a safe and effective solution for protecting high-value infrastructure and personnel in proximity to a substation.


—01


Applications:Trans-Guard FX fuses are available in a broad range of ratings. For ease of application, all designs are compatible with the industry-recognized standard mounting codes. Common applications include the Trans-Guard FX:• Installed in drywell canisters for distribution

transformer protection (see Figure 1)• Clip mounted in live-front switchgear

(see Figure 2)

• Externally mounted on overhead distribution systems, – contact factory for more information (see Figure 3)

• Installed in Elastimold® MCAN rubber molded canister for deadfront/submersible applications

• Installed directly in oil, Type 8 (contact factory for more information)

—01

• Patented damage sensor significantly reduces the risk of fuse failure should the fuse be subjected to an element-damaging current surge

• Hermetically sealed construction ensures that no gases escape from the fuse during current interruption

• All Trans-Guard FX fuses are helium mass spectrometer leak tested to ensure sealing system integrity

• Rugged machined brass end caps used for greater ferrule strength, resulting in less distortion and more secure fuse attachment in dry-well canisters

• Tested in accordance with the most recent ANSI/IEEE standards including short circuit testing at the manufacturer’s specified rated maximum application temperature (RMAT)

• Optional blown fuse indicator features a unique design that does not affect the fuse’s arcing performance

This fuse provides both overload and fault current protection for distribution equipment in a single fuse body. As a full-range fuse, it is capable of interrupting any continuous current between the minimum current that can cause melting of its elements and its rated maximum interrupting current (50,000 A).The fuses are capable of interrupting in elevated ambient temperatures up to their rated maximum application temperature (RMAT).

The Trans-Guard FX fuse is hermetically sealed and thus discharges no gases during fuse operation. An additional design distinction is its patented damage sensor that significantly reduces the potential for fuse failure in the event of element-damaging current surges.

—02

—03

—Hi-Tech® FX full-range current-limiting fusesTrans-Guard® FX full-range current-limiting fuse

—01 Figure 1 —02 Figure 2 —03 Figure 3

45H I -TECH TR A NS - G UA R D F X B ACKU P C U R R ENT- L I M ITI N G FUSE S

—Dimensional information for Trans-Guard® FX fuses

Nominal fuse voltage rating (kV)

Current rating(amps)

Dimensions in. (mm) Standard mounting codeA B C

5.5 3–75 2.25–2.18(57.0–55.3)

10.00–9.90(254.0–251.5)

1.02–1.00(25.9–25.4)

4

80–200 3.32–3.25(84.4–82.5)

17.51–17.35(444.8–440.7)

1.21–1.17(30.7–29.7)

6

8.3 3–50 2.25–2.18(57.0–55.3)

10.00–9.90(254.0–251.5)

1.02–1.00(25.9–25.4)

4

65–80 2.25–2.18(57.0–55.3)

14.31–14.21(363.5–360.9)

1.02–1.00(25.9–25.4)

5

65–125 3.32–3.25(84.4–82.5)

14.70–14.54(373.4–369.3)

1.21–1.17(30.7–29.7)

5

15.5 3–50 2.25–2.18(57.0–55.3)

14.31–14.21(363.5–360.9)

1.02–1.00(25.9–25.4)

5

65 2.25–2.18(57.0–55.3)

17.12–17.02(434.8–432.3)

1.02–1.00(25.9–25.4)

6

65–100 3.32–3.25(84.4–82.5)

17.51–17.35(444.8–440.7)

1.21–1.17(30.7–29.7)

6

23.0 6–50 2.25–2.18(57.0–55.3)

17.12–17.02(434.8–432.3)

1.02–1.00(25.9–25.4)

6

—Blown fuse indicator – Type 1

—01 Before operation—02 After operation

—01

—02

Low current interruption element (includes patented damage sensor

Tin-plated brass caps

Solid electrical connection and

sealing

Resin-rich filament woundglass/epoxy body Compacted quartz sand Welded element joints


High current interruption element

Epoxy joint

A

Length B

(Bothends)

0.625(15.9)

C

—Hi-Tech® FX backup current-limiting fusesConstruction



Fuse diameter

(in.)

Current rating

(amps)

Fusecat. no.

(N1)

Ratedmaximum

voltage (kV)

Maximum continuous current (in air) (N6) (N7) (amps)

Peak arcvoltage

(N5)(kV)

Minimum melt I2t

(amp2-sec)

Maximummelt I2t

(N3) (N4)(amp2-sec)

RMAT(N8)(°C)25 °C 40 °C 55 °C

5.5 2.2 3 HTFX220003 5.5 5.0 4.9 4.7 30 100 238 140

6 HTFX220006 11.0 10.5 10.0 25 620 1,764

8 HTFX220008 13.5 13.0 12.5 23 800.0 2,560

10 HTFX220010 16.0 15.5 15.0 23 800.0 2,560

12 HTFX220012 20.5 19.5 19.0 21 920.0 4,814

18 HTFX220018 23.5 22.5 22.0 18 1,310 5,815

20 HTFX220020 27.5 26.5 25.5 18 1,620 6,779

25 HTFX220025 37.0 35.5 34.5 18 3,660 13,747

30 HTFX220030 41.0 39.5 38.5 18 5,250 18,863

40 HTFX220040 50.0 48.5 47.0 18 8,700 31,415

50 HTFX220050 57.0 55.0 53.5 18 12,800 44,260

65 HTFX220065 69.5 67.5 64.0 17 20,500 95,000

75 HTFX220075 78.5 76.0 72.0 17 30,200 129,000

5.5 3.3 80 HTFX320080 5.5 99 96 94 15 22,100 110,000 71

100 HTFX320100 126 122 118 15 56,700 280,000

125 HTFX320125 142 138 134 15 78,300 380,000

150 HTFX320150 184 178 173 15 176,000 860,000

200 HTFX320200 208 202 196 15 259,000 1,270,000

8.3 2.2 3 HTFX230003 10.0 5.0 4.9 4.7 30 100 350 140

6 HTFX230006 11.0 10.5 10.0 32 620 2,700

8 HTFX230008 13.5 13.0 12.5 28 800 4,000

10 HTFX230010 16.0 15.5 15.0 28 800 4,000

12 HTFX230012 20.5 19.5 19.0 26 920 8,000

18 HTFX230018 23.5 22.5 22.0 26 1,310 9,500

20 HTFX230020 27.5 26.5 25.5 26 1,620 11,000

25 HTFX230025 37.0 35.5 34.5 26 3,660 22,000

30 HTFX230030 41.0 39.5 38.5 26 5,250 30,000

40 HTFX230040 50.0 48.5 47.0 26 8,700 50,000

50 HTFX230050 57.0 55.0 53.5 26 12,800 70,000

65 HTFX230065 8.8 87.0 84.0 81.5 23 34,000 200,000

80 HTFX230080 100.0 98.0 95.0 22 51,200 280,000 71

3.3 65 HTFX330065 8.3 81.0 79.0 77.0 25 25,200 100,000

80 HTFX330080 95.0 92.0 89.0 25 47,200 185,000

100 HTFX330100 120.0 117.0 113.0 25 78,300 330,000

125 HTFX330125 135.0 131.0 127.0 25 115,150 480,000

—Electrical characteristics of Trans-Guard® FX fuses (single fuses)

—Hi-Tech® FX full-range current-limiting fusesElectrical characteristics

47H I -TECH TR A NS - G UA R D F X FU L L- R A N G E C U R R ENT- L IM ITI N G FUSE S

—Electrical characteristics of Trans-Guard® FX fuses (single fuses) (continued)


Fuse diameter

(in.)

Current rating

(amps)

Fusecat. no.

(N1)

Ratedmaximum

voltage (kV)

Maximum continuous current (in air) (N6) (N7) (amps)

Peak arcvoltage

(N5)(kV)

Minimum melt I2t

(amp2-sec)

Maximummelt I2t

(N3) (N4)(amp2-sec)

RMAT(N8)(°C)25 °C 40 °C 55 °C

15.5 2.2 3 HTFX240003 17.2 5.0 4.9 4.7 51 100 510 140

6 HTFX240006 11.0 10.5 10.0 54 620 2,600

8 HTFX240008 13.5 13.0 12.5 46 800 3,700

10 HTFX240010 16.0 15.5 15.0 46 800 3,700

12 HTFX240012 20.5 19.5 19.0 43 920 6,500

18 HTFX240018 23.5 22.5 22.0 45 1,310 8,000

20 HTFX240020 27.5 26.5 25.5 45 1,620 10,000

25 HTFX240025 37.0 35.5 34.5 45 3,660 22,000

30 HTFX240030 41.0 39.5 38.5 45 5,250 30,000

40 HTFX240040 50.0 48.5 47.0 45 8,700 50,000

50 HTFX240050 53.0 51.5 50.0 45 12,800 70,000

65 HTFX240065 15.5 72.0 70.0 68.0 39 28,300 164,000 71

3.3 65 HTFX340065 78.0 75.0 73.0 40 25,200 110,000

80 HTFX340080 88.0 85.0 82.0 40 39,400 185,000

100 HTFX340100 114.0 110.0 107.0 40 80,000 380,000

23.0 2.2 6 HTFX250006 23.0 11.0 10.5 10.0 67 620 3,100 140

8 HTFX250008 13.5 13.0 12.5 61 800 4,800

10 HTFX250010 16.0 15.5 15.0 61 800 4,800

12 HTFX250012 20.5 19.5 19.0 60 920 8,300

18 HTFX250018 23.5 22.5 22.0 60 1,310 11,200

20 HTFX250020 27.5 26.5 25.5 60 1,620 13,000

25 HTFX250025 37.0 35.5 34.5 60 3,660 28,000

30 HTFX250030 41.0 39.5 38.5 60 5,250 38,000

40 HTFX250040 48.0 46.5 45.0 60 8,700 61,000

50 HTFX250050 55.0 53.0 51.5 60 12,800 82,000

Notes:N1. Ratings have maximum interrupting capability of 50 kA, except 17.2 kV 3A (HTFX240003) which tested at 44 kA.N2. Current ratings shown in chart above are achieved by using a parallel combination of two fuses (order two fuses). To facilitate equal sharing of the interrupting duty, the two fuses should be resistance matched (± 2%) and be mounted such that the current paths to and from each fuse are symmetrical.N3. Tabulated Maximum Total I2t values are for currents of 50,000 A at the nominal voltage of the fuse (except for fuses having a rated maximum voltage of 8.8 kV, in which case the maximum total I2t values are at 8.8 kV). Fuses that have a rated maximum voltage higher than their nominal voltage rating will have a higher I2t let-through when applied at voltages up to these higher values. For example, maximum total I2t values are increased by approximately 30% when 8.3 kV fuses are applied at 10 kV and approximately 25% when 15.5 kV fuses are used at 17.2 kV. N4. Maximum total I2t values are reduced for currents below 50,000 A. For example, at 10,000 A, maximum total I2t values are approximately 15% less than the published values.N5. Peak arc voltages quoted are for 50,000 A currents at the rated maximum voltage listed. Reduced currents and voltages will reduce the peak arc voltage. Consult the factory for further information.N6. Maximum continuous currents at higher ambient temperatures, and in confining enclosures:• These may be determined by derating the fuses by .2% per °C over 25 °C (for example, at 85 °C the derating would be 60 x .2 = 12%, making the maximum continuous current of a 30 A fuse 41 x .88 = 36.1 A).• When fuses are applied in a confining enclosure, such as a drywell canister, additional derating of a fuse’s maximum continuous current is necessary. Specifically, the maximum continuous current for fuses used in a dry-well canister, with the canister completely submerged in oil, will be reduced by an additional 2% (3% for fuses having a rated maximum voltage of 8.8kV). When calculating the derating for temperature, as described above, the temperature of the oil surrounding the canister should be used. For other types of enclosures, please consult the factory.N7. Reduction in the long time melting current of the fuses (approximately one hour and longer) due to higher ambient temperatures and use in enclosures is the same as described above for “Maximum Continuous Current”. See time-current characteristics for melting characteristics in this time region.N8. The 2.2"-dia. 80 A and 160 A (paralleled 80 A) fuses have an RMAT of 140 °C at a reduced rated maximum voltage of 5.5 kV.


—Hi-Tech® FX full-range current-limiting fusesElectrical characteristics

—Electrical characteristics of Trans-Guard® FX fuses (parallel fuses)

Nominal fuse voltage rating(kV)

Fusediameter

(in.)

Current rating

(amps)

Fusecat. no. (order

two fuses)(N2)

Ratedmaximum

voltage (kV)

Maximum continuous current (in air) (N6) (amps)

Peak arcvoltage

(N5)(kV)

Minimum melt I2t

(amp2-sec)

Maximummelt I2t

(N3) (N4)(amp2-sec)

RMAT(N8)(°C)25 °C 40 °C 55 °C

8.3 2.2 60 HTFX230030 10.0 80.0 77.0 75.0 26 21,000 120,000 140

80 HTFX230040 98.0 95.0 92.0 26 34,000 180,000

100 HTFX230050 8.3 111.0 108.0 105.0 24 51,200 250,000

130 HTFX230065 8.8 170.0 165.0 160.0 22 136,000 670,000

160 HTFX230080 198.0 191.0 186.0 21 204,800 890,000 40

3.3 130 HTFX330065 8.3 158.0 154.0 151.0 24 100,800 400,000 71

160 HTFX330080 186.0 180.0 175.0 24 189,000 740,000

200 HTFX330100 235.0 229.0 221.0 24 313,000 1,300,000

250 HTFX330125 265.0 256.0 249.0 24 460,500 1,800,000

15.5 2.2 60 HTFX240030 17.2 80.0 77.0 75.0 45 21,000 110,000 140

80 HTFX240040 98.0 95.0 92.0 45 34,800 170,000

100 HTFX240050 104.0 101.0 98.0 45 51,200 310,000

3.3 130 HTFX340065 15.5 152.0 147.0 143.0 39 100,800 440,000 71

160 HTFX340080 172.0 167.0 160.0 39 157,500 740,000

200 HTFX340100 222.0 214.0 208.0 39 320,000 1,520,000

Notes:N1. Ratings have maximum interrupting capability of 50 kA, except 17.2 kV 3A (HTFX240003) which tested at 44 kA.N2. Current ratings shown in chart above are achieved by using a parallel combination of two fuses (order two fuses). To facilitate equal sharing of the interrupting duty, the two fuses should be resistance matched (± 2%) and be mounted such that the current paths to and from each fuse are symmetrical.N3. Tabulated Maximum Total I2t values are for currents of 50,000 A at the nominal voltage of the fuse (except for fuses having a rated maximum voltage of 8.8 kV, in which case the maximum total I2t values are at 8.8 kV). Fuses that have a rated maximum voltage higher than their nominal voltage rating will have a higher I2t let-through when applied at voltages up to these higher values. For example, maximum total I2t values are increased by approximately 30% when 8.3 kV fuses are applied at 10 kV and approximately 25% when 15.5 kV fuses are used at 17.2 kV. N4. Maximum total I2t values are reduced for currents below 50,000 A. For example, at 10,000 A, maximum total I2t values are approximately 15% less than the published values.N5. Peak arc voltages quoted are for 50,000 A currents at the rated maximum voltage listed. Reduced currents and voltages will reduce the peak arc voltage. Consult the factory for further information.N6. Maximum continuous currents at higher ambient temperatures, and in confining enclosures:• These may be determined by derating the fuses by .2% per °C over 25 °C (for example, at 85 °C the derating would be 60 x .2 = 12%, making the maximum continuous current of a 30 A fuse 41 x .88 = 36.1 A).• When fuses are applied in a confining enclosure, such as a drywell canister, additional derating of a fuse’s maximum continuous current is necessary. Specifically, the maximum continuous current for fuses used in a dry-well canister, with the canister completely submerged in oil, will be reduced by an additional 2% (3% for fuses having a rated maximum voltage of 8.8kV). When calculating the derating for temperature, as described above, the temperature of the oil surrounding the canister should be used. For other types of enclosures, please consult the factory.N7. Reduction in the long time melting current of the fuses (approximately one hour and longer) due to higher ambient temperatures and use in enclosures is the same as described above for “Maximum Continuous Current”. See time-current characteristics for melting characteristics in this time region.N8. The 2.2"-dia. 80 A and 160 A (paralleled 80 A) fuses have an RMAT of 140 °C at a reduced rated maximum voltage of 5.5 kV.


—Recommended Trans-Guard® FX mounted in a standard drywell canister in oil (at a max. oil temp. of 100 °C)


Fuse voltage 5.5 kV 8.3 kV 15.5 kV 23 kV



2.4 4.16 4.8 7.2 7.62 12 14.4 16 19.9


10 6b 8 – 6a – 3 – 3a – 3a – 3a – 3a – 3a – 6a

15 8 12 – 6 – 6 – 3 – 3 – 3a – 3a – 3a – 6a

25 18 20 8 12 8b 10 – 6 – 6 – 3 – 3 – 3 – 6a

37.5 20 30 12 18 12b 18 8 10 – 8 – 6 – 6a – 6a – 6a

50 30 40 18 20 18 20 10 12 10 12 – 6 – 6 – 6 – 6a

75 50 75 25 40 20 30 12 20 12 20 8 12 8 10 –8 – 6

100 65 80* 30 50 25 40 20 25 20 25 12b 18 10 12 10b 12 – 8

167 100* – 65 80* 50 65 30 50 30 50 20 25 18 25 18 20 12 18

250 – – 80* – 80* – 50 60* 50 60* 25 40 20 40 20 30 18 25

333 – – – – 100* – 60* 100* 60* 100* 40 60* 30 50 25 40 20 30

500 – – – – – – – – – – 60* 80* 50 80* 40 60* 40 50

750 – – – – – – – – – – 80* – 80* – 60* 100* – –

1000 – – – – – – – – – – – – – – 100* – – –

—Recommended 8.3 kV Trans-Guard FX mounted in 15.5 kV drywell canister in oil (at a max. oil temp. of 100 °C)


Fuse voltage 8.3 kV

1-phase transformer KVA


2.4 4.16 4.8 7.2 7.62

A B A B A B A B A B

75 – 80 – – – – – – – –

100 65 80 – – – – – – – –

167 X† 160* 65 80 – 80 – – – –

250 160* – 80 130* 80 130* – 65 – 65

333 – – 130* 160* X† 160* 65 X† 65 X†

500 – – 160* – 160* – – 130* – 130*

†X=Use an 8.3 kV Drywell Canister. See top chart for fuse recommendations.Notes:Column A = 140–200% of transformer rating and Column B = 200–300% of transformer rating. Fuses recommended in bottom chart must be mounted in a 15.5kV mounting code 5 drywell canister.Recommended fuses meet inrush criteria of 12 times transformer full load current for .1 second and 25 times transformer full load current for .01 second. Fuses also meet cold load pickup criteria of six times transformer full load current for 1 second and three times transformer full load current for 10 seconds.* Indicates parallel fuse applications.a Fuse allows greater than 300% of transformer rating.b Fuse allows greater than 200% of transformer rating.

—Hi-Tech® FX full-range current-limiting fusesRecommendations


—Recommended Trans-Guard® FX mounted in a standard drywell canister in oil (at a max. oil temp. of 100 °C)




Transformer 3-phase voltage rating (kV) phase-to-phase

2.4 4.16 4.8 7.2–7.96 8.32 12.47 13.2–14.4 20.8 22.9–24.9C 34.5C


15 – 6 – 3 3 – 3a – 3a – 3a – 3a – 6a – 6a – 6a

22.5 8 10 – 6 6a – 3 – 3 – 3a – 3a – 6a – 6a – 6a

30 10 18 – 6 6 – 6a – 3 – 3a – 3a – 6a – 6a – 6a

45 18 20 8 12 8b 10 – 6 – 6 – 3 – 3 – 6a – 6a – 6a

75 25 40 18 20 12 18 8 12 8b 10 – 6 – 6 – 6a – 6a – 6a

100 40 50 20 25 18 20 12b 18 10 12 – 8 6 8 – 6a – 6a – 6a

112.5 40 65 20 30 20 25 12 18 12b 18 8b 10 – 8 – 6 – 6a – 6a

150 50 80* 25 40 25 40 18 20 18 20 10 18 10b 12 – 6 – 6 – 6a

200 75 100* 40 65 30 50 20 30 20 25 12 20 12b 18 8 10 – 8 – 6

225 80* 40 75 40 65 25 40 20 30 18 20 12 20 8 12 8 10 – 6

300 – 65 80* 50 80* 30 50 30 40 20 25 20 25 12 18 12b 18 – 8

500 – 100* – 80* – 60* 80* 50 80* 30 50 30 40 20 25 18 25 12 18

750 – – – – – 80* – 80* – 50 80* 50 60* 25 40 25 40 18 25

1000 – – – – – – – – – 60* 100* 60* 80* 40 – 40 – 20 30

1500 – – – – – – – – – – 100* – – – 50 – 40 –

2000 – – – – – – – – – – – – – – – – 50 –

—Recommended 8.3 kV Trans-Guard FX mounted in 15.5 kV drywell canister in oil (at a max. oil temp. of 100 °C)


Fuse voltage 8.3 kV



2.4 4.16 4.8 7.2–7.96 8.32

A B A B A B A B A B

112.5 – 65 – – – – – – – –

150 – 80 – – – – – – – –

200 80 X† – 65 – – – – – –

225 80 130* – 65 – 65 – – – –

300 130b* 160* 65 80 – 80 – – – –

500 160* – X† 160* 80 130* 65 80c – 80c

750 – – 160* – 130* – 80c 130* 80c 130*

1000 – – – – 160* – 130* 160c* 130b* 160c*

1500 – – – – – – 160c* – 130* –

†X=Use an 8.3 kV drywell canister. See top chart for fuse recommendations.Notes:Column A = 140–200% of transformer rating and Column B = 200–300% of transformer rating. Fuses recommended in bottom chart must be mounted in a 15.5 kV mounting code 5 drywell canister.Recommended fuses meet inrush criteria of 12 times transformer full load current for .1 second and 25 times transformer full load current for .01 second. Fuses also meet cold load pickup criteria of 6 times transformer full load current for 1 second and 3 times transformer full load current for 10 seconds.*Indicates parallel fuse applications.a Fuse allows greater than 300% of transformer rating.b Fuse allows greater than 200% of transformer rating.c Recommendations limited to GNDY-GNDY transformers with no more than 50% delta connected secondary load. Phase-to-ground rated fuses are frequently recommended for GNDY-GNDY three phase transformers. In some cases, the fuses recommended in bottom chart may be suitable for use with transformers that are not GNDY-GNDY (contact the factory for further information).



—Recommended Trans-Guard® FX mounted in air at 40 °C ambient temperature





2.4 4.16 4.8 7.2–7.96 8.32 12.47 13.2–14.4 20.8 22.9–24.9C 34.5C


15 – 6 – 3 – 3 – 3a – 3a – 3a – 3a – 6a – 6a – 6a

22.5 – 8 – 6a – 6a – 3a – 3a – 3a – 3a – 6a – 6a – 6a

30 10b 12 – 6 – 6 – 6a – 3 – 3a – 3a – 6a – 6a – 6a

45 12 18 – 8 – 8 – 6a – 6a – 3 – 3 – 6a – 6a – 6a

75 20 40 12 18 12b 18 – 8 – 8 – 6 – 6a – 6a – 6a – 6a

100 25 40 18 20 18 20 – 12 10b 12 – 8 – 6 – 6a – 6a – 6a

112.5 30 50 20 25 18 20 12b 18 – 12 – 8 – 8 – 6a – 6a – 6a

150 40 65 25 30 20 25 18 20 12 18 10b 12 8b 10 – 6 – 6 – 6a

200 65 80 30 50 25 40 20 25 18 20 12b 18 12b 18 – 8 – 8 – 6a

225 80 100 40 65 40 50 25 30 20 30 12 18 12b 18 8 10 – 8 – 6

300 80 125 50 80 40 75 25 40 25 30 18 20 18 20 – 12 10 12 – 8

500 150 – 80 125 80 100 50 (65) 40 (65) 25 40 25 40 18 25 18 25 12b 18

750 – – 125 200 125 150 (65) 100 (65) (80) 40 (65) 40 (65) 25 40 20 40 18 25

1000 – – 200 – 150 – 100 (130)* (80) (130)* (65) 100 (65) 80 30 50 30 50 20 25

1500 – – – – – – (160)* 200* (130)* 200c* 100 130* 80 130* 50 – 50 – 25 50

2000 – – – – – – 200* – 200c* 250c* 130* 200* 100 160* – – – – 40 –

2500 – – – – – – – – – – 160* 200* 130* 200* – – – – 50 –

3000 – – – – – – – – – – 200* – 200* – – – – – – –

Notes:Column A = 140–200% of transformer rating and Column B = 200–300% of transformer rating. Recommended fuses meet inrush criteria of 12 times transformer full load current for .1 second and 25 times transformer full load current for .01 second. Fuses also meet cold load pickup criteria of 6 times transformer full load current for 1 second and 3 times transformer full load current for 10 seconds.* Indicates parallel fuse applications.Ratings in parenthesis are 2.2"-dia. fuses (catalog numbers HTFX230065, HTFX230080 and HTFX240065).a Fuse allows greater than 300% of transformer rating.b Fuse allows greater than 200% of transformer rating.c Recommendations limited to GNDY-GNDY transformers with no more than 50% delta connected secondary load. Phase-to-ground rated fuses are frequently recommended for GNDY-GNDY three phase transformers.



—Fuse catalog numbers

Current rating (amps)

Fuse diameter (in.)

Cat. no.

5.5 kV 8.3 kV 15.5 kV 23.0 kV

3 2.2 HTFX220003 HTFX230003 HTFX240003 –

6 HTFX220006 HTFX230006 HTFX240006 HTFX250006










60* – HTFX230030 HTFX240030 –

65 HTFX220065 HTFX230065 HTFX240065 –

75 HTFX220075 HTFX230075 – –

80* – HTFX230080 – –

80* – HTFX230040 HTFX240040 –

100* – HTFX230050 HTFX240050 –

130* – HTFX230065 – –

160* – HTFX230080 – –

65 3.3 – HTFX330065 HTFX340065 –

80 HTFX320080 HTFX330080 HTFX340080 –

100 HTFX320100 HTFX330100 HTFX340100 –

125 HTFX320125 HTFX330125 – –

130* – HTFX330065 HTFX340065 –

150 HTFX320150 – – –

160* – HTFX330080 HTFX340080 –

200 HTFX320200 – – –

200* – HTFX330100 HTFX340100 –

250* – HTFX330125 – –

To order the proper fuse for a particular application, first determine the correct fuse voltage and current rating using either the appropriate application table (pages 49-51)

or the published performance data (pages 46-48), the applicable TCCs and peak let-through characteristics. Then refer to the chart below to determine the appropriate catalog number.

Notes: To order a fuse having a blown fuse indicator, replace the 7th character (“0”) in the catalog number with a “1” (Example: HTFX241040). Please note that indicator fuses are not suitable for use in drywell canister applications. Also, an indicator option is not available on 3 A fuses. * Current ratings shown are achieved by using a parallel combination of two fuses (order two fuses). Contact factory for ordering information concerning outdoor and under-oil fuse versions.

—Hi-Tech® FX full-range current-limiting fusesFuse ordering information

53H I -TECH TR A NS - G UA R D SX FU L L- R A N G E C U R R ENT- L IM ITI N G FUSE S

CAUTION: Trans-Guard SX fuses are NOT designed for any type of live switching operation.!

—

Hi-Tech® SX full-range current-limiting fusesTrans-Guard® SX full-range current- limiting fuse

Provides both overload and fault current protection for distribution equipment in a single fuse body.

As a full-range fuse, this fuse is capable of interrupting any continuous current between the minimum current that can cause melting of its elements and its rated maximum interrupting current (50,000 A). The fuses are capable of interrupting in elevated ambient temperatures up to their rated maximum application temperature, which is 140 °C and 71 °C for the 2.2-inch and 3.3-inch diameter designs, respectively.

The Trans-Guard SX fuse is hermetically sealed and thus discharges no gases during fuse operation. An additional design distinction is its patented damage sensor that significantly reduces the potential for fuse failure in the event of element-damaging current surges.

• Patented damage sensor significantly reduces the risk of fuse failure should the fuse be subjected to an element damaging current surge

• Hermetically sealed construction ensures that no gases escape from the fuse during current interruption.

• All Trans-Guard SX fuses are helium mass spectrometer leak tested to ensure sealing system integrity

• Rugged machined brass end caps provide greater ferrule strength, resulting in less distortion and more secure fuse attachment in wet-well fuse holders

• Tested in accordance to ANSI/IEEE standards

Application:Trans-Guard SX fuses are specifically designed to be installed in wet-well fuse holders for oil-filled padmounted switchgear and transformer applications (only 2.2-inch diameter designs are suitable for wet-well fuses holders mounted directly in transformers).



Wet well holder (kV)


rating (kV)

Current rating

(amps)

Dimensions in. (mm)

A B C

8.3 5.5 100–250 3.29(83.6)

19.06(484.1)

14.66(372.4)

8.3 5–75 2.22(56.3)

19.06(484.1)

7.93(201.4)

90–160 3.29(83.6)

19.06(484.1)

11.85(300.1)

15.5* 5–75 2.22(56.3)

19.06(484.1)

12.24(310.9)

90–150 3.29(83.6)

19.06(484.1)

14.66(372.4)

15.5 15.5 5–75 2.22(56.3)

21.12(536.4)

12.24(310.9)

90–150 3.29(83.6)

21.12(536.4)

14.66(372.4)

23.0 23.0 10–65 2.22(56.3)

21.12(536.4)

15.05(382.3)

* To order a 15.5 kV fuse that will fit in an 8.3 kV wet-well fuseholder, replace the 7th character (“0”) in the catalog number with a “2” (example: HTSX242050). See page 57.

Low current interruption element (includes patented damage sensor)


High current interruption element

Length B

Brass extenderC

Soldered electrical connection and sealing

Epoxy jointWelded element joints

Compacted quartz sand

Resin-rich filament woundglass/epoxy body

Brass caps

3⁄8-16 UNC 2B thd. 0.75" deep

A

1.00"(25.4 mm)

1.00"(25.4 mm)

—Hi-Tech® SX full-range current-limiting fusesConstruction


Nominal fuse voltagerating (kV)

Current rating

(N2) (amps)

Fuse cat. no.

(N1)

Ratedmaximum

voltage (kV)

Maximum continuous current (in oil @ 60 °C) (N5)

Peak arc voltage

(N6) (kV)

Minimum melt I2t

(amp2-sec)

Maximum melt I2t (N3) (N4)

(amp2-sec)

5.5 100 HTSX320100 5.5 114.0 15 22,100 110,000

150 HTSX320150 147.0 56,700 280,000

175 HTSX320175 172.0 78,300 380,000

225 HTSX320225 230.0 176,000 860,000

250 HTSX320250 253.0 259,000 1,270,000

8.3 5 HTSX230005 10.0 5.0 30 100 350

10 HTSX230010 11.5 32 620 2,700

12 HTSX230012 14.0 28 800 4,000

15 HTSX230015 17.0 28 800 4,000

20 HTSX230020 22.5 26 920 8,000

25 HTSX230025 25.0 26 1,310 9,500

30 HTSX230030 30.0 26 1,620 11,000

40 HTSX230040 43.0 26 3,660 22,000

50 HTSX230050 53.0 26 5,250 30,000

65 HTSX230065 65.0 26 8,700 50,000

75 HTSX230075 75.0 26 12,800 70,000

90 HTSX330090 8.3 92.0 25 25,200 100,000

100 HTSX330100 105.0 47,500 185,000

150 HTSX330150 150.0 78,300 330,000

160 HTSX330160 163.0 115,150 480,000

15.5 5 HTSX240005 17.2 5.0 51 100 510

10 HTSX240010 11.5 54 620 2,600

12 HTSX240012 14.0 46 800 3,700

15 HTSX240015 17.0 46 800 3,700

20 HTSX240020 22.5 43 920 6,500

25 HTSX240025 25.0 45 1,310 8,000

30 HTSX240030 30.0 45 1,620 10,000

40 HTSX240040 43.0 45 3,660 22,000

50 HTSX240050 53.0 45 5,250 30,000

65 HTSX240065 65.0 45 8,700 50,000

75 HTSX240075 75.0 45 12,800 70,000

90 HTSX340090 15.5 98.0 40 25,200 110,000

100 HTSX340100 117.0 39,400 185,000

150 HTSX340150 150.0 80,000 380,000

—Electrical characteristics of Trans-Guard® SX fuses

Notes:N1. Designs have maximum interrupting capability of 50 kA, except 17.2 kV 5A (HTSX24*005) which was tested at 44 kA.N2. Fuses rated 75 A and below are 2.25" in diameter. Higher ratings are 3.3" in diameter.N3. Tabulated maximum total I2t values are for currents of 50,000 A at the nominal voltage of the fuse. Fuses which have a rated maximum voltage higher than their Nominal Voltage Rating will have a higher I2t let-through when applied at voltages up to these higher values. For example, maximum total I2t values are increased by approximately 30% when 8.3 kV fuses are applied at 10 kV and approximately 25% when 15.5 kV fuses are used at 17.2 kV.N4. Maximum total I2t values are reduced for currents below 50,000A. For example, at 10,000A, I2t values are approximately 15% less than the published values.N5. Maximum continuous currents at different ambient temperatures: These may be determined by derating the fuses by 0.2% per degree C over 60 °C (for example at 80 °C the derating would be 20 x 0.2 = 4%, making the maximum continuous current of a 20 A fuse 22.5 x 0.96 = 21.6 A) or rerating the fuses by 0.2% per degree C under 60 °C (for example, at 40 °C the rerating would be 20 x 0.2 = 4%, making the maximum continuous current of a 20 A fuse 22.5 / 0.96 = 23.4 A). The long time melting current of the fuses (approximately one hour and longer) due to different ambient temperatures is the same as described above for “Maximum Continuous Currents”. See time current characteristics for melting characteristics in this time region.N6. Peak arc voltages quoted are for 50,000 A currents at the rated maximum voltage listed. Reduced currents and voltages will reduce the peak arc voltage. Consult the factory for further information.

—Hi-Tech® SX full-range current-limiting fusesElectrical characteristics


—Electrical characteristics of Trans-Guard® SX fuses (continued)

Notes:N1. Designs have maximum interrupting capability of 50 kA, except 17.2 kV 5A (HTSX24*005) which was tested at 44 kA.N2. Fuses rated 75 A and below are 2.25" in diameter. Higher ratings are 3.3" in diameter.N3. Tabulated maximum total I2t values are for currents of 50,000 A at the nominal voltage of the fuse. Fuses which have a rated maximum voltage higher than their Nominal Voltage Rating will have a higher I2t let-through when applied at voltages up to these higher values. For example, maximum total I2t values are increased by approximately 30% when 8.3 kV fuses are applied at 10 kV and approximately 25% when 15.5 kV fuses are used at 17.2 kV.N4. Maximum total I2t values are reduced for currents below 50,000 A. For example, at 10,000 A, I2t values are approximately 15% less than the published values.N5. Maximum continuous currents at different ambient temperatures: These may be determined by derating the fuses by .2% per degree C over 60 °C (for example at 80 °C the derating would be 20 x .2 = 4%, making the maximum continuous current of a 20 A fuse 22.5 x .96 = 21.6 A) or rerating the fuses by .2% per degree C under 60 °C (for example, at 40 °C the rerating would be 20 x .2 = 4%, making the maximum continuous current of a 20 A fuse 22.5 / .96 = 23.4 A). The long time melting current of the fuses (approximately one hour and longer) due to different ambient temperatures is the same as described above for “Maximum Continuous Currents”. See time current characteristics for melting characteristics in this time region.N6. Peak arc voltages quoted are for 50,000 A currents at the rated maximum voltage listed. Reduced currents and voltages will reduce the peak arc voltage. Consult the factory for further information.

Nominal fuse voltagerating (kV)

Current rating

(N2) (amps)

Fuse cat. no.

(N1)

Ratedmaximum

voltage (kV)

Maximum continuous current (in oil @ 60 °C) (N5)

Peak arc voltage

(N6) (kV)

Minimum melt I2t

(amp2-sec)

Maximum melt I2t (N3) (N4)

(amp2-sec)

23.0 10 HTSX250010 23.0 11.5 67 620 3,100

12 HTSX250012 14.0 61 800 4,800

15 HTSX250015 17.0 61 800 4,800

20 HTSX250020 22.5 60 920 8,300

25 HTSX250025 25.0 60 1,310 11,200

30 HTSX250030 30.0 60 1,620 13,000

40 HTSX250040 42.0 60 3,660 28,000

50 HTSX250050 51.0 60 5,250 38,000

65 HTSX250065 65.0 60 8,700 61,000

—Hi-Tech® SX full-range current-limiting fusesElectrical characteristics (continued)






2.4 4.16 4.8 7.2 7.62 12 14.4 16 19.9


10 – 10 – 10a – 5 – 5a – 5a – 5a – 5a – 5a – 10a

15 – 12 – 10a – 10a – 5 – 5 – 5a – 5a – 5a – 10a

25 20b 25 – 12 – 12 – 10a – 10a – 5 – 5a – 5a – 10a

37.5 30b 40 – 20 – 20a – 12 – 12a – 10a – 10a – 10a – 10a

50 40b 50 25b 30 20b 25 – 15 – 15 – 10 – 10a – 10a – 10a

75 50 65 30 40 30b 40 20b 25 – 20 – 15 – 12 – 12a – 10a

100 65 (100) 40 50 40b 50 25 30 25 30 – 20 – 15 – 15 – 12

167 (150)b (175) 65 (100) 50 75 40 50 40b 50 25 30 25b 30 20b 25 – 20

250 (150) (225) (100) (150) 75 (100) 50 75 50 65 40b 50 30 40 30b 40 25b 30

333 (225) – (150) (175) (150)b (175) 75 90 65 90 50 65 40 50 40b 50 30 40

500 (250)c – (175) (250) (150) (225) 100 150 100 150 65 90 50 75 50 65 40 50

833 – – (250)c – (250) – 160 – 160 – 100 150 90 100 75 – 65 –

1000 – – – – (250)c – – – 160c – 150 – 100 150 – – – –

1500 – – – – – – – – – 150c – 150 – – – – –

Note: Column A = 140–200% of transformer rating and Column B = 200–300% of transformer rating. See additional notes on page 58.

—Recommended Trans-Guard® SX for switchgear (mounted in a wet-well fuseholder with a max. oil temp. of 60 °C)

—Recommended Trans-Guard SX for switchgear: protecting delta connected transformers (mounted in a wet-well fuseholder with a max. oil temp. of 60 °C)





2.4 4.16 4.8 7.2–7.96 8.32 12.47 13.2–14.4 20.8


15 – 10a – 5 – 5 – 5a – 5a – 5a – 5a – 10a

22.5 – 12 – 10a – 10a – 5 – 5a – 5a – 5a – 10a

30 – 15 – 10 – 10a – 10a – 5 – 5a – 5a – 10a

45 20b 25 – 15 – 12 – 10 – 10a – 5 – 5 – 10a

75 30 40 20b 25 – 20 – 12 – 12 – 10a – 10a – 10a

100 40 50 25 30 25b 30 – 20 – 15 – 12a – 10a – 10a

112.5 40 65 30b 40 25 30 – 20 – 20a – 12 – 12a – 10a

150 65 75 40b 50 30 40 25b 30 20b 25 – 15 – 15 – 10

200 75 (100) 50 65 40 50 30 40 25 30 – 20 – 20 – 12

225 75 (100) 50 75 40 65 30 40 30b 40 20b 25 – 20 – 15

300 (150)b (175) 65 (100) 65 75 40 50 40b 50 25 30 25 30 – 20

500 (175) (250) (150)b (175) (100) (150) 65 90 50 75 40 50 40b 50 25 30

750 (250) – (150) (225) (150) (225) 90 150 75 100d 50 75 50 65 40b 50

1000 – – (225) – (175) (250) 150 160 100d 150d 75 90 65 90 50 65

1500 – – (250)c – (250) – 160 – 150d – 100 150 100 150 65 –

2000 – – – – – – – – – – 150 – 150 – – –

2500 – – – – – – – – – – 150c – 150 – – –

3000 – – – – – – – – – – – – 150c – – –

Note: Column A = 140–200% of transformer rating and Column B = 200–300% of transformer rating. See additional notes on page 58.

—Hi-Tech® SX full-range current-limiting fusesRecommendations


—Recommended Trans-Guard® SX for switchgear: Protecting GNDY-GNDY* connected transformers with less than 50% Delta connected secondary load (mounted in a wet-well fuseholder with a max. oil temp. of 60 °C)





2.4 4.16 4.8 7.2–7.96 8.32 12.47 13.2–14.4 20.8 22.9–24.9 34.5


15 – 10a – 5 – 5 – 5a – 5a – 5a – 5a – 5a 5a – 10a

22.5 – 12 – 10a – 10a – 5 – 5a – 5a – 5a – 5a 5a – 10a

30 – 15 – 10 – 10a – 10a – 5 – 5a – 5a – 5a 5a – 10a

45 20b 25 – 15 – 12 – 10 – 10a – 5 – 5 – 5a 5a – 10a

75 30 40 20b 25 – 20 – 12 – 12 – 10a – 10a – 5 5 – 10a

100 40 50 25 30 25b 30 – 20 – 15 – 12a – 10a – 10a 10a – 10a

112.5 40 65 30b 40 25 30 – 20 – 20a – 12 – 12a – 10a 10a – 10a

150 65 75 40b 50 30 40 25b 30 20b 25 – 15 – 15 – 10 10a – 10a

200 75 (100) 50 65 40 50 30 40 25 30 – 20 – 20 – 12 12 – 10a

225 75 (100) 50 75 40 65 30 40 30b 40 20b 25 – 20 – 15 12 – 10a

300 (150)b (175) 65 (100) 65 75 40 50 40b 50 25 30 25 30 – 20 20a – 12

500 (175) (250) (150)b (175) (100) (150) 65 (100) 50 75 40 50 40b 50 25 30 25b 30 – 20

750 (250) – (150) (225) (150) (225) (100) (150) 75 (100) 50 75 50 65 40b 50 40b 50 25b 30

1000 – – (225) – (175) (250) (150) (175) (150)b (175) 75 90 65 90d 50 65 40 50 30 40

1500 – – (250)c – (250) – (175) (250) (150) (225) 100 150 100d 150d 65 90 65 75 40 50

2000 – – – – – – (225) – (225) – 150 – 150d – 75 100 75 90 50 –

2500 – – – – – – (250)c – (250) – 160 – 150d – 100 150 90 150 65 –

3000 – – – – – – – – – – 160c – – – 150 100 150 – –

* Phase-to-ground rated fuses are commonly used for gndY/gndY connected transformers having no more than 50% delta connected secondary load.Notes:1. Column A = 140–200% of transformer rating and Column B = 200–300% of transformer rating. 2. Recommended fuses meet inrush criteria of 12 times transformer full load current for .1 second and 25 times transformer full load current for .01 second. Fuses also meet cold load pickup criteria of 6 times transformer full load current for 1 second and 3 times transformer full load current for 10 seconds.3. Ratings in parentheses are 5.5 kV rated fuses.a Fuse allows more than 300% of transformer rating.b Fuse allows more than 200% of transformer rating.c Fuse allows at least 125% of transformer rating.d 15.5 kV fuse must be used for voltages over 8.32 kV for delta configurations or 13.8 kV gndY/8.32 kV.

—Hi-Tech® SX full-range current-limiting fusesRecommendations


Continuous current rating (amps)

Cat. no.

5.5 kV 8.3 kV 15.5 kV 23.0 kV

5 – HTSX230005 HTSX240005 –

10 – HTSX230010 HTSX240010 HTSX250010

12 – HTSX230012 HTSX240012 HTSX250012

15 – HTSX230015 HTSX240015 HTSX250015

20 – HTSX230020 HTSX240020 HTSX250020

25 – HTSX230025 HTSX240025 HTSX250025

30 – HTSX230030 HTSX240030 HTSX250030

40 – HTSX230040 HTSX240040 HTSX250040

50 – HTSX230050 HTSX240050 HTSX250050

65 – HTSX230065 HTSX240065 HTSX250065

75 – HTSX230075 HTSX240075 –

90 – HTSX330090 HTSX340090 –

100 HTSX320100 HTSX330100 HTSX340100 –

150 HTSX320150 HTSX330150 HTSX340150 –

160 – HTSX330160 – –

175 HTSX320175 – – –

225 HTSX320225 – – –

250 HTSX320250 – – –

Note: To order a 15.5 kV fuse that will fit in an 8.3 kV wet-well fuseholder, replace the 7th character (“0”) in the catalog number with a “2” (example: HTSX242050).

—Ordering information for Trans-Guard SX fuses

To order the proper fuse for a particular application, first determine the correct fuse voltage and current rating using the published performance data (pages 55-56). Then refer to the

chart below to determine the appropriate catalog number. Alternatively, fuse selection can be determined using the accompanying charts on pages 57-58.

When replacing the obsolete AB Chance SL fuse with a Hi-Tech Trans-Guard SX fuse, it is important to recognize that the SX fuse designs should not be used on distribution systems where the primary line-to-line voltage exceeds the rated maximum voltage of the fuse as shown in the chart to the right:

This should be considered when choosing a proper replacement for the AB Chance SL fuse as they were, in some cases, used on systems having line-to-line voltages greater than that of the current-limiting fuse component of the assembly.

Again, when choosing the appropriate Hi-Tech SX fuse to replace the AB Chance SL fuse, care must be taken to ensure that the rated maximum voltage of the SX fuse exceeds the system line-to-line voltage.

—Trans-Guard SX


Current rating(amps)

Rated maximum voltage (kV)

5.5 100–250 5.5

8.3 5–75 10.0

90–160 8.3

15.5 5–75 17.2

90–150 15.5

23.0 10–65 23.0

—Important notice when using Trans-Guard SX fuses

—Hi-Tech® SX full-range current-limiting fusesTrans-Guard® SX fuse ordering information

The only exception to this requirement is when all the transformers that are downstream from the switches where the SX fuses are to be installed are GNDY-GNDY connected with less than 50% delta connected secondary load. In that case, a fuse having a rated maximum voltage exceeding the system line-to-neutral voltage may be used.


—Hi-Tech® EX full-range current-limiting fusesTrans-Guard® EX full-range current-limiting capacitor fuses

The Trans-Guard EX full-range current-limiting capacitor fuse provides both low and high current fault protection in a single, compact fuse body.

• Lowest total I2t let-throughs in the industry provide maximum protection for banks by minimizing energy let-through during a fault

• Higher melt I2t’s make fuses less susceptible to damaging current surges

• Hermetically sealed design produces no expulsion products or noise during operation and has no flying parts, making it easy to mount the fuse in confined areas

• Blown fuse indicator makes it easy to see when a fuse has operated, helping to locate failed capacitor banks

• Patented damage sensor significantly reduces

the potential for fuse failure in the event an element damaging current surge occurs

• Rigorous testing to meet ANSI/IEEE standards, including 100% physical inspection, resistance measurement and helium mass spectrometer leak testing

• High fault current interrupting capability – 50,000 A symmetrical

• Bushing and bus mount options available for indoor and outdoor applications

—01

—01 Outdoor use—02 Indoor use

—02

61H I -TECH TR A NS - G UA R D E X FU L L- R A N G E C U R R ENT- L IM ITI N G FUSE S

—Hi-Tech® EX full-range current-limiting fusesBlown fuse indicator

—01 Before operation—02 After operation

—01

—02

As a full-range fuse, the Trans-Guard® EX is capable of interrupting any current that causes melting up to its rated maximum interrupting current of 50 kA. Its ability to significantly limit energy let-through during a fault greatly reduces the likelihood of disruptive equipment failures. The blown fuse indicator makes it easy to see when a fuse has operated, helping to locate failed capacitor banks.

The Indoor versions of the Trans-Guard EX current-limiting capacitor fuses are used in metal-enclosed capacitor banks, harmonic filter banks and padmounted capacitor banks. Outdoor versions are coated with an oven-baked UV acrylic paint and are used in open rack-mounted systems. All Trans-Guard EX fuses provide protection

against disruptive equipment failures, such as a case rupture, when a dielectric or non-dielectric fault occurs within the capacitor. Fuses are sized to withstand transient inrush currents associated with back-to-back capacitor bank switching.

The Trans-Guard EX fuse is hermetically sealed so no external expulsion gases are produced during interruption and it has no moving parts. This makes it ideal for bus-mounting or bushing-mounting, and both indoor and outdoor versions are available. An additional design distinction is its patented damage sensor which significantly reduces the potential for fuse failure in the event of element-damaging current surges.



Current rating

(amps)

Dimensions in. (mm)

Fuse length “A”

Tag length “B”

Fuse diameter “C”

Tag offset “D”

5.5 6–75 8.0 (203) 2.9 (74) 2.2 (56) 1.125 (29)

80–200 14.7 (373) 2.5 (64) 3.3 (84) 1.75 (44)

8.3 6–50 8.0 (203) 2.9 (74) 2.2 (56) 1.125 (29)

65–125 11.9 (302) 2.5 (64) 3.3 (84) 1.75 (44)

15.5 6–50 12.3 (312) 2.9 (74) 2.2 (56) 1.125 (29)

65–100 14.7 (373) 2.5 (64) 3.3 (84) 1.75 (44)

23.0 6–50 15.1 (384) 2.9 (74) 2.2 (56) 1.125 (29)

Blown fuse indicator

1⁄2"–13 UNC thread min. thread depth = 0.64"

'D'

1.

12

5"

0.5" x 1.5" Slot

1 . 25"

'D'

'B'

'A'

'B'

'A'

'B'

'C'

BUSHINGMOUNT BUS

MOUNT

'C'

Bushing mount

Bus mount

0.5" X 1.5" Slot

1.25"

1.12

5"

D D

B B

B

AA

C C


—Hi-Tech® EX full-range current-limiting fusesOrdering information and electrical characteristics



Indoor cat. no. Outdoor cat. no.Minimum melt

I2t (A2 sec)Maximum total

I2t (A2 sec)Bus mount Bushing mount Bus mount Bushing mount

5.5 6 HTEX22T006 HTEX22D006 HTEX22U006 HTEX22C006 620 2,700

8 HTEX22T008 HTEX22D008 HTEX22U008 HTEX22C008 800 4,000



18 HTEX22T018 HTEX22D018 HTEX22U018 HTEX22C018 1,310 9,500












200 HTEX32T200 HTEX32D200 HTEX32U200 HTEX32C200 259,000 1,270,000















—Fuse ordering and electrical characteristic information

63H I -TECH TR A NS - G UA R D E X FU L L- R A N G E C U R R ENT- L IM ITI N G FUSE S

—Hi-Tech® EX full-range current-limiting fusesOrdering information, electrical characteristics and fuse selection

The fuse current rating should be greater than 1.5 x capacitor rated current. This 50% protective margin accounts for normal overvoltages, harmonics and capacitor tolerances.

Example: The rated current for a single-phase 150 kVAR 4.16 kV capacitor is 150 kVAR/4.16 kV = 36 A. Multiplying by the protective margin factor gives 36 A x 1.5 = 54 A. A 65 A fuse should therefore be used.

To select the proper fuse for a single-phase capacitor application, please refer to the table below. —

Single-phase capacitor fuse recommendations

Fuse voltage rating (kV)

Capacitor voltage

rating (V)

Fuse current rating

50 kVAR 100 kVAR 150 kVAR 200 kVAR 300 kVAR 400 kVAR 500 kVAR

5.5 2.4–2.77 30 65 100 125 200* – –

4.16 18 40 65 75 125 150* 200*

4.8 18 40 50 65 100 125 200*

8.3 6.64 12 25 40 50 80 100 125

7.2 12 25 40 50 65 100 125

7.62–7.96 10 20 30 40 65 80 100

8.32 10 18 30 40 65 80 100

15.5 9.96 8 18 25 30 50 65 80

12.47–14.4 6 12 18 25 40 50 65

23.0 19.9–21.6 6 8 12 18 25 30 40

Note: All fuses meet “safe zone” tank rupture curves for type EX or equivalent capacitors unless denoted *.



Indoor cat. no. Outdoor cat. no.Minimum melt

I2t (A2 sec)Maximum total

I2t (A2 sec)Bus mount Bushing mount Bus mount Bushing mount














23 6 HTEX25T006 HTEX25D006 HTEX25U006 HTEX25C006 620 3,100










—Fuse ordering and electrical characteristic information (continued)

—Fuse selection


—Notes

65N OTE S


Additional informationWe reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. ABB AG does not accept any responsibility whatsoever for potential errors or possible lack of information in this document.

We reserve all rights in this document and in the subject matter and illustrations contained therein. Any reproduction, disclosure to third parties or utilization of its contents – in whole or in parts – is forbidden without prior written consent of ABB AG.

67A RTI CL E O R CH A P TER T ITL E

© Copyright 2018 ABB. All rights reserved. Specifications subject to change without notice. 7T

KK

00

010

8 R

EV

A 0

6.1

1.20

18

—USABB Installation ProductsElectrification Products division860 Ridge Lake Blvd.Memphis, TN 38120+1 901-252-5000 tnb.abb.com

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